what should be in the introduction of a research paper

How to Write a Research Paper Introduction (with Examples)

The research paper introduction section, along with the Title and Abstract, can be considered the face of any research paper. The following article is intended to guide you in organizing and writing the research paper introduction for a quality academic article or dissertation.

The research paper introduction aims to present the topic to the reader. A study will only be accepted for publishing if you can ascertain that the available literature cannot answer your research question. So it is important to ensure that you have read important studies on that particular topic, especially those within the last five to ten years, and that they are properly referenced in this section. 1 What should be included in the research paper introduction is decided by what you want to tell readers about the reason behind the research and how you plan to fill the knowledge gap. The best research paper introduction provides a systemic review of existing work and demonstrates additional work that needs to be done. It needs to be brief, captivating, and well-referenced; a well-drafted research paper introduction will help the researcher win half the battle.

The introduction for a research paper is where you set up your topic and approach for the reader. It has several key goals:

• Present your research topic
• Capture reader interest
• Summarize existing research
• Position your own approach
• Define your specific research problem and problem statement
• Highlight the novelty and contributions of the study
• Give an overview of the paper’s structure

The research paper introduction can vary in size and structure depending on whether your paper presents the results of original empirical research or is a review paper. Some research paper introduction examples are only half a page while others are a few pages long. In many cases, the introduction will be shorter than all of the other sections of your paper; its length depends on the size of your paper as a whole.

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What is the introduction for a research paper, what are the parts of introduction in the research, 1. introduce the research topic:, 2. determine a research niche:, 3. place your research within the research niche:, how to use paperpal to write the introduction section, frequently asked questions on research paper introduction, key points to remember.

The introduction in a research paper is placed at the beginning to guide the reader from a broad subject area to the specific topic that your research addresses. They present the following information to the reader

• Scope: The topic covered in the research paper
• Context: Background of your topic
• Importance: Why your research matters in that particular area of research and the industry problem that can be targeted

Why is the introduction important in a research paper?

The research paper introduction conveys a lot of information and can be considered an essential roadmap for the rest of your paper. A good introduction for a research paper is important for the following reasons:

• It stimulates your reader’s interest: A good introduction section can make your readers want to read your paper by capturing their interest. It informs the reader what they are going to learn and helps determine if the topic is of interest to them.
• It helps the reader understand the research background: Without a clear introduction, your readers may feel confused and even struggle when reading your paper. A good research paper introduction will prepare them for the in-depth research to come. It provides you the opportunity to engage with the readers and demonstrate your knowledge and authority on the specific topic.
• It explains why your research paper is worth reading: Your introduction can convey a lot of information to your readers. It introduces the topic, why the topic is important, and how you plan to proceed with your research.
• It helps guide the reader through the rest of the paper: The research paper introduction gives the reader a sense of the nature of the information that will support your arguments and the general organization of the paragraphs that will follow. It offers an overview of what to expect when reading the main body of your paper.

A good research paper introduction section should comprise three main elements: 2

• What is known: This sets the stage for your research. It informs the readers of what is known on the subject.
• What is lacking: This is aimed at justifying the reason for carrying out your research. This could involve investigating a new concept or method or building upon previous research.
• What you aim to do: This part briefly states the objectives of your research and its major contributions. Your detailed hypothesis will also form a part of this section.

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How to write a research paper introduction?

The first step in writing the research paper introduction is to inform the reader what your topic is and why it’s interesting or important. This is generally accomplished with a strong opening statement. The second step involves establishing the kinds of research that have been done and ending with limitations or gaps in the research that you intend to address. Finally, the research paper introduction clarifies how your own research fits in and what problem it addresses. If your research involved testing hypotheses, these should be stated along with your research question. The hypothesis should be presented in the past tense since it will have been tested by the time you are writing the research paper introduction.

The following key points, with examples, can guide you when writing the research paper introduction section:

• Highlight the importance of the research field or topic
• Describe the background of the topic
• Present an overview of current research on the topic

Example: The inclusion of experiential and competency-based learning has benefitted electronics engineering education. Industry partnerships provide an excellent alternative for students wanting to engage in solving real-world challenges. Industry-academia participation has grown in recent years due to the need for skilled engineers with practical training and specialized expertise. However, from the educational perspective, many activities are needed to incorporate sustainable development goals into the university curricula and consolidate learning innovation in universities.

• Reveal a gap in existing research or oppose an existing assumption
• Formulate the research question

Example: There have been plausible efforts to integrate educational activities in higher education electronics engineering programs. However, very few studies have considered using educational research methods for performance evaluation of competency-based higher engineering education, with a focus on technical and or transversal skills. To remedy the current need for evaluating competencies in STEM fields and providing sustainable development goals in engineering education, in this study, a comparison was drawn between study groups without and with industry partners.

• State the purpose of your study
• Highlight the key characteristics of your study
• Describe important results
• Highlight the novelty of the study.
• Offer a brief overview of the structure of the paper.

Example: The study evaluates the main competency needed in the applied electronics course, which is a fundamental core subject for many electronics engineering undergraduate programs. We compared two groups, without and with an industrial partner, that offered real-world projects to solve during the semester. This comparison can help determine significant differences in both groups in terms of developing subject competency and achieving sustainable development goals.

Write a Research Paper Introduction in Minutes with Paperpal

Paperpal is a generative AI-powered academic writing assistant. It’s trained on millions of published scholarly articles and over 20 years of STM experience. Paperpal helps authors write better and faster with:

• Real-time writing suggestions
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With Paperpal, create a research paper introduction effortlessly. In this step-by-step guide, we’ll walk you through how Paperpal transforms your initial ideas into a polished and publication-ready introduction.

Step 1: Sign up on Paperpal and click on the Copilot feature, under this choose Outlines > Research Article > Introduction

Step 2: Add your unstructured notes or initial draft, whether in English or another language, to Paperpal, which is to be used as the base for your content.

Step 3: Fill in the specifics, such as your field of study, brief description or details you want to include, which will help the AI generate the outline for your Introduction.

Step 4: Use this outline and sentence suggestions to develop your content, adding citations where needed and modifying it to align with your specific research focus.

Step 5: Turn to Paperpal’s granular language checks to refine your content, tailor it to reflect your personal writing style, and ensure it effectively conveys your message.

You can use the same process to develop each section of your article, and finally your research paper in half the time and without any of the stress.

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The purpose of the research paper introduction is to introduce the reader to the problem definition, justify the need for the study, and describe the main theme of the study. The aim is to gain the reader’s attention by providing them with necessary background information and establishing the main purpose and direction of the research.

The length of the research paper introduction can vary across journals and disciplines. While there are no strict word limits for writing the research paper introduction, an ideal length would be one page, with a maximum of 400 words over 1-4 paragraphs. Generally, it is one of the shorter sections of the paper as the reader is assumed to have at least a reasonable knowledge about the topic. 2 For example, for a study evaluating the role of building design in ensuring fire safety, there is no need to discuss definitions and nature of fire in the introduction; you could start by commenting upon the existing practices for fire safety and how your study will add to the existing knowledge and practice.

When deciding what to include in the research paper introduction, the rest of the paper should also be considered. The aim is to introduce the reader smoothly to the topic and facilitate an easy read without much dependency on external sources. 3 Below is a list of elements you can include to prepare a research paper introduction outline and follow it when you are writing the research paper introduction. Topic introduction: This can include key definitions and a brief history of the topic. Research context and background: Offer the readers some general information and then narrow it down to specific aspects. Details of the research you conducted: A brief literature review can be included to support your arguments or line of thought. Rationale for the study: This establishes the relevance of your study and establishes its importance. Importance of your research: The main contributions are highlighted to help establish the novelty of your study Research hypothesis: Introduce your research question and propose an expected outcome. Organization of the paper: Include a short paragraph of 3-4 sentences that highlights your plan for the entire paper

Cite only works that are most relevant to your topic; as a general rule, you can include one to three. Note that readers want to see evidence of original thinking. So it is better to avoid using too many references as it does not leave much room for your personal standpoint to shine through. Citations in your research paper introduction support the key points, and the number of citations depend on the subject matter and the point discussed. If the research paper introduction is too long or overflowing with citations, it is better to cite a few review articles rather than the individual articles summarized in the review. A good point to remember when citing research papers in the introduction section is to include at least one-third of the references in the introduction.

The literature review plays a significant role in the research paper introduction section. A good literature review accomplishes the following: Introduces the topic – Establishes the study’s significance – Provides an overview of the relevant literature – Provides context for the study using literature – Identifies knowledge gaps However, remember to avoid making the following mistakes when writing a research paper introduction: Do not use studies from the literature review to aggressively support your research Avoid direct quoting Do not allow literature review to be the focus of this section. Instead, the literature review should only aid in setting a foundation for the manuscript.

Remember the following key points for writing a good research paper introduction: 4

• Avoid stuffing too much general information: Avoid including what an average reader would know and include only that information related to the problem being addressed in the research paper introduction. For example, when describing a comparative study of non-traditional methods for mechanical design optimization, information related to the traditional methods and differences between traditional and non-traditional methods would not be relevant. In this case, the introduction for the research paper should begin with the state-of-the-art non-traditional methods and methods to evaluate the efficiency of newly developed algorithms.
• Avoid packing too many references: Cite only the required works in your research paper introduction. The other works can be included in the discussion section to strengthen your findings.
• Avoid extensive criticism of previous studies: Avoid being overly critical of earlier studies while setting the rationale for your study. A better place for this would be the Discussion section, where you can highlight the advantages of your method.
• Avoid describing conclusions of the study: When writing a research paper introduction remember not to include the findings of your study. The aim is to let the readers know what question is being answered. The actual answer should only be given in the Results and Discussion section.

To summarize, the research paper introduction section should be brief yet informative. It should convince the reader the need to conduct the study and motivate him to read further. If you’re feeling stuck or unsure, choose trusted AI academic writing assistants like Paperpal to effortlessly craft your research paper introduction and other sections of your research article.

1. Jawaid, S. A., & Jawaid, M. (2019). How to write introduction and discussion. Saudi Journal of Anaesthesia, 13(Suppl 1), S18.

2. Dewan, P., & Gupta, P. (2016). Writing the title, abstract and introduction: Looks matter!. Indian pediatrics, 53, 235-241.

3. Cetin, S., & Hackam, D. J. (2005). An approach to the writing of a scientific Manuscript1. Journal of Surgical Research, 128(2), 165-167.

4. Bavdekar, S. B. (2015). Writing introduction: Laying the foundations of a research paper. Journal of the Association of Physicians of India, 63(7), 44-6.

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Ertugrul Portakal

Apr 12, 2024

Writing a Research Paper Introduction (with 3 Examples)

Nail your research paper's introduction! Learn to captivate and inform readers from the start—our guide shows how!

TABLE OF CONTENTS

A catchy and informative introduction is essential in academic writing, especially if you want your readers to have background information about your paper. However, writing an interesting and informative introduction can sometimes be a time-consuming and tiring process. If you don't know where to start when crafting an introduction, no need to worry - we've got you covered!

In this article, we will explain step by step what an introduction is in academic writing and how to write it!

Ready? Let's start!

• An introduction is a paragraph that provides information about your entire paper and aims to attract and inform the reader.
• Before writing an introduction or even starting your paper, you need to research academic sources.
• The first one or two sentences of an introduction paragraph should be a hook to attract the reader's attention.
• Afterwards, you need to prepare the reader for your argument by giving background information about your topic.
• Finally, you should state your argument about your topic with a thesis statement.
• If you are writing a longer paper, you can inform your readers about the map of your paper.
• If you are looking for an AI assistant to support you throughout your writing process, TextCortex is designed for you with its advanced features.

What is an Introduction in a research paper?

In any academic writing, including essays and research papers, an introduction is the first paragraph that the reader will encounter. This paragraph should both attract the reader's attention and give them the necessary information about the paper. In any academic paper, the introduction paragraph constitutes 10% of the paper's total word count. For example, if you are preparing a 3,000-word paper, your introduction paragraph should consist of approximately 300 words. You should also write sentences within these 300 words that will attract the reader's attention and provide them with information about the paper.

Importance of an Introduction Paragraph

The biggest function of an introduction paragraph is to prepare the reader for the author's thesis statement. A traditional introduction paragraph begins with a few sentences or questions that will catch the reader's attention. After attracting the reader's attention, necessary background information on the subject is given. Finally, the author explains to the readers what the whole paper is about by stating the thesis. A thesis statement is the final sentence that summarizes the main points of your paper and conveys your claim.

First Things First: Preliminary Research

When working on any academic writing type, it is essential to start by researching your topic thoroughly before beginning to type. What sets academic writing apart from other writing types is the requirement for it to be written using accurate information from reliable sources.

Researching academic sources can be a time-consuming and unnecessary process. One has to read through hundreds of pages, review dozens of articles and verify the accuracy of each source. However, if you're looking to reduce your workload and maximize efficiency by automating repetitive tasks such as literature review, ZenoChat is the perfect solution for you. With its web search feature, ZenoChat can use the entire internet as a data source. Additionally, by activating the "scholar" option of the ZenoChat web search feature, you can ensure that it only uses academic sources when generating output.

How to Create an Introduction for Academic Writing?

Creating an introduction paragraph that is interesting, informative, and conveys your thesis is an easier process than it seems. As long as you have sufficient information about your topic and an outline , you can write engaging introductions by following a few simple steps. Let's take a closer look at how to write an introduction for academic writing.

1-) Start with a Catchy Hook

Your first sentence is one of the factors that most influence a reader's decision to read your paper. This sentence determines the tone of your paper and attracts the reader's attention. For this reason, we recommend that you start your introduction paragraph with a strong and catchy hook sentence.

• Avoid long and complex sentences
• Use clear and concise sentences
• Write a sentence that will spark the reader's curiosity
• You can ask questions that will encourage the reader to read the remaining paragraph
• Avoid fact or overly broad sentences
• Avoid using dictionary definitions as your hook

2-) Give Background Information

After writing a strong hook sentence, you need to provide basic information about your topic so that the reader can understand what they will learn about when they read your paper. In this section, you can benefit from opinions that support or oppose your argument. Additionally, this section should refer to the body paragraphs of your writing.

• You can write a background information sentence for each body paragraph.
• The information here should be concise and compact
• Avoid talking about your evidence and results unless necessary.

3-) State Your Thesis 

After attracting the reader's attention and providing background information, it is time to present your approach and argument towards the topic with a thesis statement. A thesis statement usually comprises one or two sentences and communicates the paper's argument to the reader. A well-written thesis statement should express your stance on the topic.

• Avoid merely stating a fact
• Claim your argument

4-) Tell Reader About Your Paper

Although you need to move on to body paragraphs after the thesis statement in short papers, it will be useful to add a few sentences that will guide the reader in your longer papers. This way, your readers can better understand which arguments they will encounter on which pages and the course of your paper. That leads the reader to clearly understand and follow your content.

Let’s Wrap it Up

Writing an interesting and informative introduction is usually a long process that requires a lot of rewriting. You may need to rewrite a sentence dozens of times so that your words and sentences clearly describe your paper and argument. Fortunately, you can generate state-of-the-art introductions using AI tools and use them with a little editing.

When it comes to text generation, paraphrasing, and grammar & spelling checking, TextCortex is the way to go with its advanced LLMs and customization options. With TextCortex, you can generate all writing types, including introduction, from scratch, rewrite your existing texts, change their tone of voice, or fix their grammar. TextCortex is available as a web application and browser extension. The TextCortex browser extension is integrated with 30,000+ websites and apps. So, you can complete your AI-driven writing tasks anywhere and anytime.

Let's examine a few sample introductions generated by TextCortex.

Example Introduction #1

“Should social media platforms be banned from collecting their users' data?”

Example Introduction #2

“Do electric vehicles decrease overall emissions?”

Example Introduction #3

“Is graffiti an act of vandalism or the creation of art?”

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Home » Research Paper Introduction – Writing Guide and Examples

Research Paper Introduction – Writing Guide and Examples

Table of Contents

Research Paper Introduction

Research paper introduction is the first section of a research paper that provides an overview of the study, its purpose, and the research question (s) or hypothesis (es) being investigated. It typically includes background information about the topic, a review of previous research in the field, and a statement of the research objectives. The introduction is intended to provide the reader with a clear understanding of the research problem, why it is important, and how the study will contribute to existing knowledge in the field. It also sets the tone for the rest of the paper and helps to establish the author’s credibility and expertise on the subject.

How to Write Research Paper Introduction

Writing an introduction for a research paper can be challenging because it sets the tone for the entire paper. Here are some steps to follow to help you write an effective research paper introduction:

• Start with a hook : Begin your introduction with an attention-grabbing statement, a question, or a surprising fact that will make the reader interested in reading further.
• Provide background information: After the hook, provide background information on the topic. This information should give the reader a general idea of what the topic is about and why it is important.
• State the research problem: Clearly state the research problem or question that the paper addresses. This should be done in a concise and straightforward manner.
• State the research objectives: After stating the research problem, clearly state the research objectives. This will give the reader an idea of what the paper aims to achieve.
• Provide a brief overview of the paper: At the end of the introduction, provide a brief overview of the paper. This should include a summary of the main points that will be discussed in the paper.
• Revise and refine: Finally, revise and refine your introduction to ensure that it is clear, concise, and engaging.

Structure of Research Paper Introduction

The following is a typical structure for a research paper introduction:

• Background Information: This section provides an overview of the topic of the research paper, including relevant background information and any previous research that has been done on the topic. It helps to give the reader a sense of the context for the study.
• Problem Statement: This section identifies the specific problem or issue that the research paper is addressing. It should be clear and concise, and it should articulate the gap in knowledge that the study aims to fill.
• Research Question/Hypothesis : This section states the research question or hypothesis that the study aims to answer. It should be specific and focused, and it should clearly connect to the problem statement.
• Significance of the Study: This section explains why the research is important and what the potential implications of the study are. It should highlight the contribution that the research makes to the field.
• Methodology: This section describes the research methods that were used to conduct the study. It should be detailed enough to allow the reader to understand how the study was conducted and to evaluate the validity of the results.
• Organization of the Paper : This section provides a brief overview of the structure of the research paper. It should give the reader a sense of what to expect in each section of the paper.

Research Paper Introduction Examples

Research Paper Introduction Examples could be:

Example 1: In recent years, the use of artificial intelligence (AI) has become increasingly prevalent in various industries, including healthcare. AI algorithms are being developed to assist with medical diagnoses, treatment recommendations, and patient monitoring. However, as the use of AI in healthcare grows, ethical concerns regarding privacy, bias, and accountability have emerged. This paper aims to explore the ethical implications of AI in healthcare and propose recommendations for addressing these concerns.

Example 2: Climate change is one of the most pressing issues facing our planet today. The increasing concentration of greenhouse gases in the atmosphere has resulted in rising temperatures, changing weather patterns, and other environmental impacts. In this paper, we will review the scientific evidence on climate change, discuss the potential consequences of inaction, and propose solutions for mitigating its effects.

Example 3: The rise of social media has transformed the way we communicate and interact with each other. While social media platforms offer many benefits, including increased connectivity and access to information, they also present numerous challenges. In this paper, we will examine the impact of social media on mental health, privacy, and democracy, and propose solutions for addressing these issues.

Example 4: The use of renewable energy sources has become increasingly important in the face of climate change and environmental degradation. While renewable energy technologies offer many benefits, including reduced greenhouse gas emissions and energy independence, they also present numerous challenges. In this paper, we will assess the current state of renewable energy technology, discuss the economic and political barriers to its adoption, and propose solutions for promoting the widespread use of renewable energy.

Purpose of Research Paper Introduction

The introduction section of a research paper serves several important purposes, including:

• Providing context: The introduction should give readers a general understanding of the topic, including its background, significance, and relevance to the field.
• Presenting the research question or problem: The introduction should clearly state the research question or problem that the paper aims to address. This helps readers understand the purpose of the study and what the author hopes to accomplish.
• Reviewing the literature: The introduction should summarize the current state of knowledge on the topic, highlighting the gaps and limitations in existing research. This shows readers why the study is important and necessary.
• Outlining the scope and objectives of the study: The introduction should describe the scope and objectives of the study, including what aspects of the topic will be covered, what data will be collected, and what methods will be used.
• Previewing the main findings and conclusions : The introduction should provide a brief overview of the main findings and conclusions that the study will present. This helps readers anticipate what they can expect to learn from the paper.

When to Write Research Paper Introduction

The introduction of a research paper is typically written after the research has been conducted and the data has been analyzed. This is because the introduction should provide an overview of the research problem, the purpose of the study, and the research questions or hypotheses that will be investigated.

Once you have a clear understanding of the research problem and the questions that you want to explore, you can begin to write the introduction. It’s important to keep in mind that the introduction should be written in a way that engages the reader and provides a clear rationale for the study. It should also provide context for the research by reviewing relevant literature and explaining how the study fits into the larger field of research.

Advantages of Research Paper Introduction

The introduction of a research paper has several advantages, including:

• Establishing the purpose of the research: The introduction provides an overview of the research problem, question, or hypothesis, and the objectives of the study. This helps to clarify the purpose of the research and provide a roadmap for the reader to follow.
• Providing background information: The introduction also provides background information on the topic, including a review of relevant literature and research. This helps the reader understand the context of the study and how it fits into the broader field of research.
• Demonstrating the significance of the research: The introduction also explains why the research is important and relevant. This helps the reader understand the value of the study and why it is worth reading.
• Setting expectations: The introduction sets the tone for the rest of the paper and prepares the reader for what is to come. This helps the reader understand what to expect and how to approach the paper.
• Grabbing the reader’s attention: A well-written introduction can grab the reader’s attention and make them interested in reading further. This is important because it can help to keep the reader engaged and motivated to read the rest of the paper.
• Creating a strong first impression: The introduction is the first part of the research paper that the reader will see, and it can create a strong first impression. A well-written introduction can make the reader more likely to take the research seriously and view it as credible.
• Establishing the author’s credibility: The introduction can also establish the author’s credibility as a researcher. By providing a clear and thorough overview of the research problem and relevant literature, the author can demonstrate their expertise and knowledge in the field.
• Providing a structure for the paper: The introduction can also provide a structure for the rest of the paper. By outlining the main sections and sub-sections of the paper, the introduction can help the reader navigate the paper and find the information they are looking for.

About the author

Muhammad Hassan

Researcher, Academic Writer, Web developer

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The introduction leads the reader from a general subject area to a particular topic of inquiry. It establishes the scope, context, and significance of the research being conducted by summarizing current understanding and background information about the topic, stating the purpose of the work in the form of the research problem supported by a hypothesis or a set of questions, explaining briefly the methodological approach used to examine the research problem, highlighting the potential outcomes your study can reveal, and outlining the remaining structure and organization of the paper.

Key Elements of the Research Proposal. Prepared under the direction of the Superintendent and by the 2010 Curriculum Design and Writing Team. Baltimore County Public Schools.

Importance of a Good Introduction

Think of the introduction as a mental road map that must answer for the reader these four questions:

• What was I studying?
• Why was this topic important to investigate?
• What did we know about this topic before I did this study?
• How will this study advance new knowledge or new ways of understanding?

According to Reyes, there are three overarching goals of a good introduction: 1) ensure that you summarize prior studies about the topic in a manner that lays a foundation for understanding the research problem; 2) explain how your study specifically addresses gaps in the literature, insufficient consideration of the topic, or other deficiency in the literature; and, 3) note the broader theoretical, empirical, and/or policy contributions and implications of your research.

A well-written introduction is important because, quite simply, you never get a second chance to make a good first impression. The opening paragraphs of your paper will provide your readers with their initial impressions about the logic of your argument, your writing style, the overall quality of your research, and, ultimately, the validity of your findings and conclusions. A vague, disorganized, or error-filled introduction will create a negative impression, whereas, a concise, engaging, and well-written introduction will lead your readers to think highly of your analytical skills, your writing style, and your research approach. All introductions should conclude with a brief paragraph that describes the organization of the rest of the paper.

Hirano, Eliana. “Research Article Introductions in English for Specific Purposes: A Comparison between Brazilian, Portuguese, and English.” English for Specific Purposes 28 (October 2009): 240-250; Samraj, B. “Introductions in Research Articles: Variations Across Disciplines.” English for Specific Purposes 21 (2002): 1–17; Introductions. The Writing Center. University of North Carolina; “Writing Introductions.” In Good Essay Writing: A Social Sciences Guide. Peter Redman. 4th edition. (London: Sage, 2011), pp. 63-70; Reyes, Victoria. Demystifying the Journal Article. Inside Higher Education.

Structure and Writing Style

I.  Structure and Approach

The introduction is the broad beginning of the paper that answers three important questions for the reader:

• What is this?
• Why should I read it?
• What do you want me to think about / consider doing / react to?

Think of the structure of the introduction as an inverted triangle of information that lays a foundation for understanding the research problem. Organize the information so as to present the more general aspects of the topic early in the introduction, then narrow your analysis to more specific topical information that provides context, finally arriving at your research problem and the rationale for studying it [often written as a series of key questions to be addressed or framed as a hypothesis or set of assumptions to be tested] and, whenever possible, a description of the potential outcomes your study can reveal.

These are general phases associated with writing an introduction: 1.  Establish an area to research by:

• Highlighting the importance of the topic, and/or
• Making general statements about the topic, and/or
• Presenting an overview on current research on the subject.

2.  Identify a research niche by:

• Opposing an existing assumption, and/or
• Revealing a gap in existing research, and/or
• Formulating a research question or problem, and/or
• Continuing a disciplinary tradition.

3.  Place your research within the research niche by:

• Stating the intent of your study,
• Outlining the key characteristics of your study,
• Describing important results, and
• Giving a brief overview of the structure of the paper.

NOTE:   It is often useful to review the introduction late in the writing process. This is appropriate because outcomes are unknown until you've completed the study. After you complete writing the body of the paper, go back and review introductory descriptions of the structure of the paper, the method of data gathering, the reporting and analysis of results, and the conclusion. Reviewing and, if necessary, rewriting the introduction ensures that it correctly matches the overall structure of your final paper.

II.  Delimitations of the Study

Delimitations refer to those characteristics that limit the scope and define the conceptual boundaries of your research . This is determined by the conscious exclusionary and inclusionary decisions you make about how to investigate the research problem. In other words, not only should you tell the reader what it is you are studying and why, but you must also acknowledge why you rejected alternative approaches that could have been used to examine the topic.

Obviously, the first limiting step was the choice of research problem itself. However, implicit are other, related problems that could have been chosen but were rejected. These should be noted in the conclusion of your introduction. For example, a delimitating statement could read, "Although many factors can be understood to impact the likelihood young people will vote, this study will focus on socioeconomic factors related to the need to work full-time while in school." The point is not to document every possible delimiting factor, but to highlight why previously researched issues related to the topic were not addressed.

Examples of delimitating choices would be:

• The key aims and objectives of your study,
• The research questions that you address,
• The variables of interest [i.e., the various factors and features of the phenomenon being studied],
• The method(s) of investigation,
• The time period your study covers, and
• Any relevant alternative theoretical frameworks that could have been adopted.

Review each of these decisions. Not only do you clearly establish what you intend to accomplish in your research, but you should also include a declaration of what the study does not intend to cover. In the latter case, your exclusionary decisions should be based upon criteria understood as, "not interesting"; "not directly relevant"; “too problematic because..."; "not feasible," and the like. Make this reasoning explicit!

NOTE:   Delimitations refer to the initial choices made about the broader, overall design of your study and should not be confused with documenting the limitations of your study discovered after the research has been completed.

ANOTHER NOTE: Do not view delimitating statements as admitting to an inherent failing or shortcoming in your research. They are an accepted element of academic writing intended to keep the reader focused on the research problem by explicitly defining the conceptual boundaries and scope of your study. It addresses any critical questions in the reader's mind of, "Why the hell didn't the author examine this?"

III.  The Narrative Flow

Issues to keep in mind that will help the narrative flow in your introduction :

• Your introduction should clearly identify the subject area of interest . A simple strategy to follow is to use key words from your title in the first few sentences of the introduction. This will help focus the introduction on the topic at the appropriate level and ensures that you get to the subject matter quickly without losing focus, or discussing information that is too general.
• Establish context by providing a brief and balanced review of the pertinent published literature that is available on the subject. The key is to summarize for the reader what is known about the specific research problem before you did your analysis. This part of your introduction should not represent a comprehensive literature review--that comes next. It consists of a general review of the important, foundational research literature [with citations] that establishes a foundation for understanding key elements of the research problem. See the drop-down menu under this tab for " Background Information " regarding types of contexts.
• Clearly state the hypothesis that you investigated . When you are first learning to write in this format it is okay, and actually preferable, to use a past statement like, "The purpose of this study was to...." or "We investigated three possible mechanisms to explain the...."
• Why did you choose this kind of research study or design? Provide a clear statement of the rationale for your approach to the problem studied. This will usually follow your statement of purpose in the last paragraph of the introduction.

IV.  Engaging the Reader

A research problem in the social sciences can come across as dry and uninteresting to anyone unfamiliar with the topic . Therefore, one of the goals of your introduction is to make readers want to read your paper. Here are several strategies you can use to grab the reader's attention:

• Open with a compelling story . Almost all research problems in the social sciences, no matter how obscure or esoteric , are really about the lives of people. Telling a story that humanizes an issue can help illuminate the significance of the problem and help the reader empathize with those affected by the condition being studied.
• Include a strong quotation or a vivid, perhaps unexpected, anecdote . During your review of the literature, make note of any quotes or anecdotes that grab your attention because they can used in your introduction to highlight the research problem in a captivating way.
• Pose a provocative or thought-provoking question . Your research problem should be framed by a set of questions to be addressed or hypotheses to be tested. However, a provocative question can be presented in the beginning of your introduction that challenges an existing assumption or compels the reader to consider an alternative viewpoint that helps establish the significance of your study. 
• Describe a puzzling scenario or incongruity . This involves highlighting an interesting quandary concerning the research problem or describing contradictory findings from prior studies about a topic. Posing what is essentially an unresolved intellectual riddle about the problem can engage the reader's interest in the study.
• Cite a stirring example or case study that illustrates why the research problem is important . Draw upon the findings of others to demonstrate the significance of the problem and to describe how your study builds upon or offers alternatives ways of investigating this prior research.

NOTE:   It is important that you choose only one of the suggested strategies for engaging your readers. This avoids giving an impression that your paper is more flash than substance and does not distract from the substance of your study.

Freedman, Leora  and Jerry Plotnick. Introductions and Conclusions. University College Writing Centre. University of Toronto; Introduction. The Structure, Format, Content, and Style of a Journal-Style Scientific Paper. Department of Biology. Bates College; Introductions. The Writing Center. University of North Carolina; Introductions. The Writer’s Handbook. Writing Center. University of Wisconsin, Madison; Introductions, Body Paragraphs, and Conclusions for an Argument Paper. The Writing Lab and The OWL. Purdue University; “Writing Introductions.” In Good Essay Writing: A Social Sciences Guide . Peter Redman. 4th edition. (London: Sage, 2011), pp. 63-70; Resources for Writers: Introduction Strategies. Program in Writing and Humanistic Studies. Massachusetts Institute of Technology; Sharpling, Gerald. Writing an Introduction. Centre for Applied Linguistics, University of Warwick; Samraj, B. “Introductions in Research Articles: Variations Across Disciplines.” English for Specific Purposes 21 (2002): 1–17; Swales, John and Christine B. Feak. Academic Writing for Graduate Students: Essential Skills and Tasks . 2nd edition. Ann Arbor, MI: University of Michigan Press, 2004 ; Writing Your Introduction. Department of English Writing Guide. George Mason University.

Writing Tip

Avoid the "Dictionary" Introduction

Giving the dictionary definition of words related to the research problem may appear appropriate because it is important to define specific terminology that readers may be unfamiliar with. However, anyone can look a word up in the dictionary and a general dictionary is not a particularly authoritative source because it doesn't take into account the context of your topic and doesn't offer particularly detailed information. Also, placed in the context of a particular discipline, a term or concept may have a different meaning than what is found in a general dictionary. If you feel that you must seek out an authoritative definition, use a subject specific dictionary or encyclopedia [e.g., if you are a sociology student, search for dictionaries of sociology]. A good database for obtaining definitive definitions of concepts or terms is Credo Reference .

Saba, Robert. The College Research Paper. Florida International University; Introductions. The Writing Center. University of North Carolina.

Another Writing Tip

When Do I Begin?

A common question asked at the start of any paper is, "Where should I begin?" An equally important question to ask yourself is, "When do I begin?" Research problems in the social sciences rarely rest in isolation from history. Therefore, it is important to lay a foundation for understanding the historical context underpinning the research problem. However, this information should be brief and succinct and begin at a point in time that illustrates the study's overall importance. For example, a study that investigates coffee cultivation and export in West Africa as a key stimulus for local economic growth needs to describe the beginning of exporting coffee in the region and establishing why economic growth is important. You do not need to give a long historical explanation about coffee exports in Africa. If a research problem requires a substantial exploration of the historical context, do this in the literature review section. In your introduction, make note of this as part of the "roadmap" [see below] that you use to describe the organization of your paper.

Introductions. The Writing Center. University of North Carolina; “Writing Introductions.” In Good Essay Writing: A Social Sciences Guide . Peter Redman. 4th edition. (London: Sage, 2011), pp. 63-70.

Yet Another Writing Tip

Always End with a Roadmap

The final paragraph or sentences of your introduction should forecast your main arguments and conclusions and provide a brief description of the rest of the paper [the "roadmap"] that let's the reader know where you are going and what to expect. A roadmap is important because it helps the reader place the research problem within the context of their own perspectives about the topic. In addition, concluding your introduction with an explicit roadmap tells the reader that you have a clear understanding of the structural purpose of your paper. In this way, the roadmap acts as a type of promise to yourself and to your readers that you will follow a consistent and coherent approach to addressing the topic of inquiry. Refer to it often to help keep your writing focused and organized.

Cassuto, Leonard. “On the Dissertation: How to Write the Introduction.” The Chronicle of Higher Education , May 28, 2018; Radich, Michael. A Student's Guide to Writing in East Asian Studies . (Cambridge, MA: Harvard University Writing n. d.), pp. 35-37.

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What is a "good" introduction?

Citing sources in the introduction, "introduction checklist" from: how to write a good scientific paper. chris a. mack. spie. 2018..

• LITERATURE CITED
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This is where you describe briefly and clearly why you are writing the paper. The introduction supplies sufficient background information for the reader to understand and evaluate the experiment you did. It also supplies a rationale for the study.

• Present the problem and the proposed solution
• Presents nature and scope of the problem investigated
• Reviews the pertinent literature to orient the reader
• States the method of the experiment
• State the principle results of the experiment

It is important to cite sources in the introduction section of your paper as evidence of the claims you are making. There are ways of citing sources in the text so that the reader can find the full reference in the literature cited section at the end of the paper, yet the flow of the reading is not badly interrupted. Below are some example of how this can be done:     "Smith (1983) found that N-fixing plants could be infected by several different species of Rhizobium."     "Walnut trees are known to be allelopathic (Smith 1949,  Bond et al. 1955, Jones and Green 1963)."     "Although the presence of Rhizobium normally increases the growth of legumes (Nguyen 1987), the opposite effect has been observed (Washington 1999)." Note that articles by one or two authors are always cited in the text using their last names. However, if there are more than two authors, the last name of the 1st author is given followed by the abbreviation et al. which is Latin for "and others". 

From:  https://writingcenter.gmu.edu/guides/imrad-reports-introductions

• Indicate the field of the work, why this field is important, and what has already been done (with proper citations).
• Indicate a gap, raise a research question, or challenge prior work in this territory.
• Outline the purpose and announce the present research, clearly indicating what is novel and why it is significant.
• Avoid: repeating the abstract; providing unnecessary background information; exaggerating the importance of the work; claiming novelty without a proper literature search. 
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• If you are writing in a new discipline, you should always make sure to ask about conventions and expectations for introductions, just as you would for any other aspect of the essay. For example, while it may be acceptable to write a two-paragraph (or longer) introduction for your papers in some courses, instructors in other disciplines, such as those in some Government courses, may expect a shorter introduction that includes a preview of the argument that will follow.  
• In some disciplines (Government, Economics, and others), it’s common to offer an overview in the introduction of what points you will make in your essay. In other disciplines, you will not be expected to provide this overview in your introduction.  
• Avoid writing a very general opening sentence. While it may be true that “Since the dawn of time, people have been telling love stories,” it won’t help you explain what’s interesting about your topic.  
• Avoid writing a “funnel” introduction in which you begin with a very broad statement about a topic and move to a narrow statement about that topic. Broad generalizations about a topic will not add to your readers’ understanding of your specific essay topic.  
• Avoid beginning with a dictionary definition of a term or concept you will be writing about. If the concept is complicated or unfamiliar to your readers, you will need to define it in detail later in your essay. If it’s not complicated, you can assume your readers already know the definition.  
• Avoid offering too much detail in your introduction that a reader could better understand later in the paper.
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How to write an effective introduction for your research paper

Last updated

20 January 2024

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However, the introduction is a vital element of your research paper . It helps the reader decide whether your paper is worth their time. As such, it's worth taking your time to get it right.

In this article, we'll tell you everything you need to know about writing an effective introduction for your research paper.

• The importance of an introduction in research papers

The primary purpose of an introduction is to provide an overview of your paper. This lets readers gauge whether they want to continue reading or not. The introduction should provide a meaningful roadmap of your research to help them make this decision. It should let readers know whether the information they're interested in is likely to be found in the pages that follow.

Aside from providing readers with information about the content of your paper, the introduction also sets the tone. It shows readers the style of language they can expect, which can further help them to decide how far to read.

When you take into account both of these roles that an introduction plays, it becomes clear that crafting an engaging introduction is the best way to get your paper read more widely. First impressions count, and the introduction provides that impression to readers.

• The optimum length for a research paper introduction

While there's no magic formula to determine exactly how long a research paper introduction should be, there are a few guidelines. Some variables that impact the ideal introduction length include:

Field of study

Complexity of the topic

Specific requirements of the course or publication

A commonly recommended length of a research paper introduction is around 10% of the total paper’s length. So, a ten-page paper has a one-page introduction. If the topic is complex, it may require more background to craft a compelling intro. Humanities papers tend to have longer introductions than those of the hard sciences.

The best way to craft an introduction of the right length is to focus on clarity and conciseness. Tell the reader only what is necessary to set up your research. An introduction edited down with this goal in mind should end up at an acceptable length.

• Evaluating successful research paper introductions

A good way to gauge how to create a great introduction is by looking at examples from across your field. The most influential and well-regarded papers should provide some insights into what makes a good introduction.

Dissecting examples: what works and why

We can make some general assumptions by looking at common elements of a good introduction, regardless of the field of research.

A common structure is to start with a broad context, and then narrow that down to specific research questions or hypotheses. This creates a funnel that establishes the scope and relevance.

The most effective introductions are careful about the assumptions they make regarding reader knowledge. By clearly defining key terms and concepts instead of assuming the reader is familiar with them, these introductions set a more solid foundation for understanding.

To pull in the reader and make that all-important good first impression, excellent research paper introductions will often incorporate a compelling narrative or some striking fact that grabs the reader's attention.

Finally, good introductions provide clear citations from past research to back up the claims they're making. In the case of argumentative papers or essays (those that take a stance on a topic or issue), a strong thesis statement compels the reader to continue reading.

Common pitfalls to avoid in research paper introductions

You can also learn what not to do by looking at other research papers. Many authors have made mistakes you can learn from.

We've talked about the need to be clear and concise. Many introductions fail at this; they're verbose, vague, or otherwise fail to convey the research problem or hypothesis efficiently. This often comes in the form of an overemphasis on background information, which obscures the main research focus.

Ensure your introduction provides the proper emphasis and excitement around your research and its significance. Otherwise, fewer people will want to read more about it.

• Crafting a compelling introduction for a research paper

Let’s take a look at the steps required to craft an introduction that pulls readers in and compels them to learn more about your research.

Step 1: Capturing interest and setting the scene

To capture the reader's interest immediately, begin your introduction with a compelling question, a surprising fact, a provocative quote, or some other mechanism that will hook readers and pull them further into the paper.

As they continue reading, the introduction should contextualize your research within the current field, showing readers its relevance and importance. Clarify any essential terms that will help them better understand what you're saying. This keeps the fundamentals of your research accessible to all readers from all backgrounds.

Step 2: Building a solid foundation with background information

Including background information in your introduction serves two major purposes:

It helps to clarify the topic for the reader

It establishes the depth of your research

The approach you take when conveying this information depends on the type of paper.

For argumentative papers, you'll want to develop engaging background narratives. These should provide context for the argument you'll be presenting.

For empirical papers, highlighting past research is the key. Often, there will be some questions that weren't answered in those past papers. If your paper is focused on those areas, those papers make ideal candidates for you to discuss and critique in your introduction.

Step 3: Pinpointing the research challenge

To capture the attention of the reader, you need to explain what research challenges you'll be discussing.

For argumentative papers, this involves articulating why the argument you'll be making is important. What is its relevance to current discussions or problems? What is the potential impact of people accepting or rejecting your argument?

For empirical papers, explain how your research is addressing a gap in existing knowledge. What new insights or contributions will your research bring to your field?

Step 4: Clarifying your research aims and objectives

We mentioned earlier that the introduction to a research paper can serve as a roadmap for what's within. We've also frequently discussed the need for clarity. This step addresses both of these.

When writing an argumentative paper, craft a thesis statement with impact. Clearly articulate what your position is and the main points you intend to present. This will map out for the reader exactly what they'll get from reading the rest.

For empirical papers, focus on formulating precise research questions and hypotheses. Directly link them to the gaps or issues you've identified in existing research to show the reader the precise direction your research paper will take.

Step 5: Sketching the blueprint of your study

Continue building a roadmap for your readers by designing a structured outline for the paper. Guide the reader through your research journey, explaining what the different sections will contain and their relationship to one another.

This outline should flow seamlessly as you move from section to section. Creating this outline early can also help guide the creation of the paper itself, resulting in a final product that's better organized. In doing so, you'll craft a paper where each section flows intuitively from the next.

Step 6: Integrating your research question

To avoid letting your research question get lost in background information or clarifications, craft your introduction in such a way that the research question resonates throughout. The research question should clearly address a gap in existing knowledge or offer a new perspective on an existing problem.

Tell users your research question explicitly but also remember to frequently come back to it. When providing context or clarification, point out how it relates to the research question. This keeps your focus where it needs to be and prevents the topic of the paper from becoming under-emphasized.

Step 7: Establishing the scope and limitations

So far, we've talked mostly about what's in the paper and how to convey that information to readers. The opposite is also important. Information that's outside the scope of your paper should be made clear to the reader in the introduction so their expectations for what is to follow are set appropriately.

Similarly, be honest and upfront about the limitations of the study. Any constraints in methodology, data, or how far your findings can be generalized should be fully communicated in the introduction.

Step 8: Concluding the introduction with a promise

The final few lines of the introduction are your last chance to convince people to continue reading the rest of the paper. Here is where you should make it very clear what benefit they'll get from doing so. What topics will be covered? What questions will be answered? Make it clear what they will get for continuing.

By providing a quick recap of the key points contained in the introduction in its final lines and properly setting the stage for what follows in the rest of the paper, you refocus the reader's attention on the topic of your research and guide them to read more.

• Research paper introduction best practices

Following the steps above will give you a compelling introduction that hits on all the key points an introduction should have. Some more tips and tricks can make an introduction even more polished.

As you follow the steps above, keep the following tips in mind.

Set the right tone and style

Like every piece of writing, a research paper should be written for the audience. That is to say, it should match the tone and style that your academic discipline and target audience expect. This is typically a formal and academic tone, though the degree of formality varies by field.

Kno w the audience

The perfect introduction balances clarity with conciseness. The amount of clarification required for a given topic depends greatly on the target audience. Knowing who will be reading your paper will guide you in determining how much background information is required.

Adopt the CARS (create a research space) model

The CARS model is a helpful tool for structuring introductions. This structure has three parts. The beginning of the introduction establishes the general research area. Next, relevant literature is reviewed and critiqued. The final section outlines the purpose of your study as it relates to the previous parts.

Master the art of funneling

The CARS method is one example of a well-funneled introduction. These start broadly and then slowly narrow down to your specific research problem. It provides a nice narrative flow that provides the right information at the right time. If you stray from the CARS model, try to retain this same type of funneling.

Incorporate narrative element

People read research papers largely to be informed. But to inform the reader, you have to hold their attention. A narrative style, particularly in the introduction, is a great way to do that. This can be a compelling story, an intriguing question, or a description of a real-world problem.

Write the introduction last

By writing the introduction after the rest of the paper, you'll have a better idea of what your research entails and how the paper is structured. This prevents the common problem of writing something in the introduction and then forgetting to include it in the paper. It also means anything particularly exciting in the paper isn’t neglected in the intro.

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How to Write an Introduction for a Research Paper

Table of Contents

Writing an introduction for a research paper is a critical element of your paper, but it can seem challenging to encapsulate enormous amount of information into a concise form. The introduction of your research paper sets the tone for your research and provides the context for your study. In this article, we will guide you through the process of writing an effective introduction that grabs the reader's attention and captures the essence of your research paper.

Understanding the Purpose of a Research Paper Introduction

The introduction acts as a road map for your research paper, guiding the reader through the main ideas and arguments. The purpose of the introduction is to present your research topic to the readers and provide a rationale for why your study is relevant. It helps the reader locate your research and its relevance in the broader field of related scientific explorations. Additionally, the introduction should inform the reader about the objectives and scope of your study, giving them an overview of what to expect in the paper. By including a comprehensive introduction, you establish your credibility as an author and convince the reader that your research is worth their time and attention.

Key Elements to Include in Your Introduction

When writing your research paper introduction, there are several key elements you should include to ensure it is comprehensive and informative.

• A hook or attention-grabbing statement to capture the reader's interest.  It can be a thought-provoking question, a surprising statistic, or a compelling anecdote that relates to your research topic.
• A brief overview of the research topic and its significance. By highlighting the gap in existing knowledge or the problem your research aims to address, you create a compelling case for the relevance of your study.
• A clear research question or problem statement. This serves as the foundation of your research and guides the reader in understanding the unique focus of your study. It should be concise, specific, and clearly articulated.
• An outline of the paper's structure and main arguments, to help the readers navigate through the paper with ease.

Preparing to Write Your Introduction

Before diving into writing your introduction, it is essential to prepare adequately. This involves 3 important steps:

• Conducting Preliminary Research: Immerse yourself in the existing literature to develop a clear research question and position your study within the academic discourse.
• Identifying Your Thesis Statement: Define a specific, focused, and debatable thesis statement, serving as a roadmap for your paper.
• Considering Broader Context: Reflect on the significance of your research within your field, understanding its potential impact and contribution.

By engaging in these preparatory steps, you can ensure that your introduction is well-informed, focused, and sets the stage for a compelling research paper.

Structuring Your Introduction

Now that you have prepared yourself to tackle the introduction, it's time to structure it effectively. A well-structured introduction will engage the reader from the beginning and provide a logical flow to your research paper.

Starting with a Hook

Begin your introduction with an attention-grabbing hook that captivates the reader's interest. This hook serves as a way to make your introduction more engaging and compelling. For example, if you are writing a research paper on the impact of climate change on biodiversity, you could start your introduction with a statistic about the number of species that have gone extinct due to climate change. This will immediately grab the reader's attention and make them realize the urgency and importance of the topic.

Introducing Your Topic

Provide a brief overview, which should give the reader a general understanding of the subject matter and its significance. Explain the importance of the topic and its relevance to the field. This will help the reader understand why your research is significant and why they should continue reading. Continuing with the example of climate change and biodiversity, you could explain how climate change is one of the greatest threats to global biodiversity, how it affects ecosystems, and the potential consequences for both wildlife and human populations. By providing this context, you are setting the stage for the rest of your research paper and helping the reader understand the importance of your study.

Presenting Your Thesis Statement

The thesis statement should directly address your research question and provide a preview of the main arguments or findings discussed in your paper. Make sure your thesis statement is clear, concise, and well-supported by the evidence you will present in your research paper. By presenting a strong and focused thesis statement, you are providing the reader with the information they could anticipate in your research paper. This will help them understand the purpose and scope of your study and will make them more inclined to continue reading.

Writing Techniques for an Effective Introduction

When crafting an introduction, it is crucial to pay attention to the finer details that can elevate your writing to the next level. By utilizing specific writing techniques, you can captivate your readers and draw them into your research journey.

Using Clear and Concise Language

One of the most important writing techniques to employ in your introduction is the use of clear and concise language. By choosing your words carefully, you can effectively convey your ideas to the reader. It is essential to avoid using jargon or complex terminology that may confuse or alienate your audience. Instead, focus on communicating your research in a straightforward manner to ensure that your introduction is accessible to both experts in your field and those who may be new to the topic. This approach allows you to engage a broader audience and make your research more inclusive.

Establishing the Relevance of Your Research

One way to establish the relevance of your research is by highlighting how it fills a gap in the existing literature. Explain how your study addresses a significant research question that has not been adequately explored. By doing this, you demonstrate that your research is not only unique but also contributes to the broader knowledge in your field. Furthermore, it is important to emphasize the potential impact of your research. Whether it is advancing scientific understanding, informing policy decisions, or improving practical applications, make it clear to the reader how your study can make a difference.

By employing these two writing techniques in your introduction, you can effectively engage your readers. Take your time to craft an introduction that is both informative and captivating, leaving your readers eager to delve deeper into your research.

Revising and Polishing Your Introduction

Once you have written your introduction, it is crucial to revise and polish it to ensure that it effectively sets the stage for your research paper.

Self-Editing Techniques

Review your introduction for clarity, coherence, and logical flow. Ensure each paragraph introduces a new idea or argument with smooth transitions.

Check for grammatical errors, spelling mistakes, and awkward sentence structures.

Ensure that your introduction aligns with the overall tone and style of your research paper.

Seeking Feedback for Improvement

Consider seeking feedback from peers, colleagues, or your instructor. They can provide valuable insights and suggestions for improving your introduction. Be open to constructive criticism and use it to refine your introduction and make it more compelling for the reader.

Writing an introduction for a research paper requires careful thought and planning. By understanding the purpose of the introduction, preparing adequately, structuring effectively, and employing writing techniques, you can create an engaging and informative introduction for your research. Remember to revise and polish your introduction to ensure that it accurately represents the main ideas and arguments in your research paper. With a well-crafted introduction, you will capture the reader's attention and keep them inclined to your paper.

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How to Write a Research Introduction

Last Updated: December 6, 2023 Fact Checked

This article was co-authored by Megan Morgan, PhD . Megan Morgan is a Graduate Program Academic Advisor in the School of Public & International Affairs at the University of Georgia. She earned her PhD in English from the University of Georgia in 2015. There are 7 references cited in this article, which can be found at the bottom of the page. This article has been fact-checked, ensuring the accuracy of any cited facts and confirming the authority of its sources. This article has been viewed 2,657,343 times.

The introduction to a research paper can be the most challenging part of the paper to write. The length of the introduction will vary depending on the type of research paper you are writing. An introduction should announce your topic, provide context and a rationale for your work, before stating your research questions and hypothesis. Well-written introductions set the tone for the paper, catch the reader's interest, and communicate the hypothesis or thesis statement.

Introducing the Topic of the Paper

• In scientific papers this is sometimes known as an "inverted triangle", where you start with the broadest material at the start, before zooming in on the specifics. [2] X Research source
• The sentence "Throughout the 20th century, our views of life on other planets have drastically changed" introduces a topic, but does so in broad terms.
• It provides the reader with an indication of the content of the essay and encourages them to read on.

• For example, if you were writing a paper about the behaviour of mice when exposed to a particular substance, you would include the word "mice", and the scientific name of the relevant compound in the first sentences.
• If you were writing a history paper about the impact of the First World War on gender relations in Britain, you should mention those key words in your first few lines.

• This is especially important if you are attempting to develop a new conceptualization that uses language and terminology your readers may be unfamiliar with.

• If you use an anecdote ensure that is short and highly relevant for your research. It has to function in the same way as an alternative opening, namely to announce the topic of your research paper to your reader.
• For example, if you were writing a sociology paper about re-offending rates among young offenders, you could include a brief story of one person whose story reflects and introduces your topic.
• This kind of approach is generally not appropriate for the introduction to a natural or physical sciences research paper where the writing conventions are different.

Establishing the Context for Your Paper

• It is important to be concise in the introduction, so provide an overview on recent developments in the primary research rather than a lengthy discussion.
• You can follow the "inverted triangle" principle to focus in from the broader themes to those to which you are making a direct contribution with your paper.
• A strong literature review presents important background information to your own research and indicates the importance of the field.

• By making clear reference to existing work you can demonstrate explicitly the specific contribution you are making to move the field forward.
• You can identify a gap in the existing scholarship and explain how you are addressing it and moving understanding forward.

• For example, if you are writing a scientific paper you could stress the merits of the experimental approach or models you have used.
• Stress what is novel in your research and the significance of your new approach, but don't give too much detail in the introduction.
• A stated rationale could be something like: "the study evaluates the previously unknown anti-inflammatory effects of a topical compound in order to evaluate its potential clinical uses".

Specifying Your Research Questions and Hypothesis

• The research question or questions generally come towards the end of the introduction, and should be concise and closely focused.
• The research question might recall some of the key words established in the first few sentences and the title of your paper.
• An example of a research question could be "what were the consequences of the North American Free Trade Agreement on the Mexican export economy?"
• This could be honed further to be specific by referring to a particular element of the Free Trade Agreement and the impact on a particular industry in Mexico, such as clothing manufacture.
• A good research question should shape a problem into a testable hypothesis.

• If possible try to avoid using the word "hypothesis" and rather make this implicit in your writing. This can make your writing appear less formulaic.
• In a scientific paper, giving a clear one-sentence overview of your results and their relation to your hypothesis makes the information clear and accessible. [10] X Trustworthy Source PubMed Central Journal archive from the U.S. National Institutes of Health Go to source
• An example of a hypothesis could be "mice deprived of food for the duration of the study were expected to become more lethargic than those fed normally".

• This is not always necessary and you should pay attention to the writing conventions in your discipline.
• In a natural sciences paper, for example, there is a fairly rigid structure which you will be following.
• A humanities or social science paper will most likely present more opportunities to deviate in how you structure your paper.

Research Introduction Help

Community Q&A

• Use your research papers' outline to help you decide what information to include when writing an introduction. Thanks Helpful 0 Not Helpful 1
• Consider drafting your introduction after you have already completed the rest of your research paper. Writing introductions last can help ensure that you don't leave out any major points. Thanks Helpful 0 Not Helpful 0

• Avoid emotional or sensational introductions; these can create distrust in the reader. Thanks Helpful 51 Not Helpful 12
• Generally avoid using personal pronouns in your introduction, such as "I," "me," "we," "us," "my," "mine," or "our." Thanks Helpful 32 Not Helpful 7
• Don't overwhelm the reader with an over-abundance of information. Keep the introduction as concise as possible by saving specific details for the body of your paper. Thanks Helpful 25 Not Helpful 14

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• ↑ https://library.sacredheart.edu/c.php?g=29803&p=185916
• ↑ https://www.aresearchguide.com/inverted-pyramid-structure-in-writing.html
• ↑ https://libguides.usc.edu/writingguide/introduction
• ↑ https://writing.wisc.edu/Handbook/PlanResearchPaper.html
• ↑ https://dept.writing.wisc.edu/wac/writing-an-introduction-for-a-scientific-paper/
• ↑ https://writing.wisc.edu/handbook/assignments/planresearchpaper/
• ↑ http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3178846/

About This Article

To introduce your research paper, use the first 1-2 sentences to describe your general topic, such as “women in World War I.” Include and define keywords, such as “gender relations,” to show your reader where you’re going. Mention previous research into the topic with a phrase like, “Others have studied…”, then transition into what your contribution will be and why it’s necessary. Finally, state the questions that your paper will address and propose your “answer” to them as your thesis statement. For more information from our English Ph.D. co-author about how to craft a strong hypothesis and thesis, keep reading! Did this summary help you? Yes No

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Research Blog

How to write a research paper introduction (with examples).

I hope you enjoy reading this blog post.

If you would like to learn more about research, check out this  Research Course .

Welcome to our comprehensive guide on crafting the perfect introduction for your research paper. In this blog, we’ll explore the crucial elements of a strong introduction, highlight common pitfalls to avoid, and provide practical tips to effectively set the stage for your study’s objectives and significance. 

Table of Contents

Lack of a clear thesis statement, lack of clear objectives and scope, failure to establish the research significance, insufficient background information, inadequate literature review, ignoring the research gap, overly technical language, poor organization and flow, neglecting the audience, the importance of a good introduction.

A strong introduction sets the tone for the entire paper, guiding the reader through the research journey. It provides context, establishes relevance, and ensures the reader understands the importance of the study.

Starting a research project is exciting, but getting the introduction right is key. It’s like opening the door to your study and inviting readers in. However, there are some common missteps that can trip you up along the way.

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Common mistakes to avoid.

A thesis statement is the central argument or claim that guides the entire research paper. It is a concise summary of the main point or claim of the paper and is typically found at the end of the introduction. A clear thesis statement helps to focus the research, provide direction, and inform the reader of the paper’s purpose. Expert reviewers may even skip the rest of the introduction (as they are well versed in the topic) and focus only on your thesis statement, so it’s vital to make sure it is perfect!

When a research introduction lacks a clear thesis statement, several issues can arise:

• Ambiguity : Without a clear thesis, the reader may be confused about the paper’s purpose and the main argument. Do not talk in vague terms. Whenever possible, use terminology established in recent literature. Narrow down the key aspects of the association that you are investigating (the study sample, the outcome and predictor measures) as much as possible.
• Lack of Focus : The paper can become unfocused and meander through unrelated topics, making it difficult for the reader to follow the argument. Do not try to have more than 1-2 main aims in a paper. Even if you have done supplementary analysis, it is better to say so in the discussion. As a rule of thumb, try to answer one major question only!
• Weak Argumentation : A well-defined thesis provides a strong foundation for building arguments. Without it, the arguments may appear weak and unsupported.

Let's be more practical:

1- In this paper, I will discuss climate change.

• Problem: This statement is too broad and vague. It does not provide a clear direction or specific argument.

2- This paper argues that climate change, measured by global average temperature change, is primarily driven by human activities, such as deforestation and the burning of fossil fuels, and proposes policy measures to mitigate its impact.(1)

• Strengths: – Specificity : It clearly states that the paper will focus on human activities as the main drivers of climate change. – Argument : It presents a specific claim that the paper will argue. – Direction : It hints at the structure of the paper by mentioning policy measures.

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Powerful Tips:

• Be Specific : Clearly define the main argument or claim. Avoid vague or broad statements.
• Be Concise : Keep the thesis statement concise, ideally one to two sentences.
• Provide Direction : Indicate the structure of the paper by hinting at the main points that will be discussed.
• Revise as Needed : Be prepared to revise the thesis statement as your research progresses and your understanding deepens.

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A clear statement of objectives and scope is crucial in a research paper introduction because it outlines what the study aims to achieve and defines the boundaries within which the research will be conducted.

Example of Lacking Clear Objectives and Scope: This paper examines the impacts of climate change on agriculture.

• Problem : This statement is too broad and vague. It does not specify what aspects of climate change or agriculture will be studied, nor does it define the geographical or temporal scope.

Example with Clear Objectives and Scope: This study aims to investigate the effects of rising temperatures and changing precipitation patterns on crop yields in the Midwest United States from 2000 to 2010. The objectives are to (1) assess the impact of temperature changes on corn and soybean yields, (2) analyze how variations in precipitation affect crop growth, and (3) identify adaptive strategies employed by farmers in the region.(2)

Powerful tips:

• Be Specific : Clearly state what the study aims to achieve and avoid vague or broad statements.
• Identify Key Areas : Outline the main areas or aspects that the research will focus on.
• Set Boundaries : Define the geographical, temporal, and conceptual boundaries of the research.
• List Objectives : Clearly articulate specific research objectives or questions that the study will address.
• Stay Realistic : Ensure that the objectives and scope are achievable within the constraints of the research project.
• Make it flow : Make sure you are not repeating the same concepts as the thesis statement, as these two sections are often presented back-to-back in the final paragraph of the introduction! Remember: the thesis statement is your hypothesis or question, and your objectives are ‘how’ you are going to test your thesis.

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This mistake can result in the research appearing trivial or irrelevant, diminishing its potential impact. When the significance of the research is not well-established, readers may struggle to understand the value of the study and why they should care about it.

Example of Failure to Establish Research Significance: This study investigates the effects of social media usage on sleep patterns among teenagers.

• Problem : The significance of studying social media’s impact on sleep patterns is not explained. The reader may wonder why this research is important or what implications it has.

Example with Established Research Significance: This study investigates the effects of social media usage on sleep patterns among teenagers. Understanding this relationship is crucial because insufficient sleep is linked to numerous health issues, including decreased academic performance, heightened stress levels, and increased risk of mental health problems. With the pervasive use of social media among adolescents, identifying how it impacts sleep can inform strategies for promoting healthier habits and improving overall well-being in this vulnerable age group.(3)

• Link to Broader Issues : Connect the research topic to broader issues or trends that highlight its relevance and importance.
• Explain Practical Implications : Discuss the potential practical applications or benefits of the research findings.
• Address Gaps in Knowledge : Identify gaps in the existing literature that the research aims to fill.
• Highlight Potential Impact : Emphasize the potential impact of the research on the field, society, or specific populations.
• Use Concrete Examples : Provide concrete examples or scenarios to illustrate the significance of the research.

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Insufficient background information in the introduction of a research paper refers to failing to provide enough context for the reader to understand the research problem and its significance. Background information sets the stage for the research by offering necessary details about the topic, relevant theories, previous studies, and key terms.

This may lead to:

• Reader Confusion : Without adequate context, readers may struggle to understand the research question, its importance, and how it fits into the broader field of study.
• Weak Justification : Insufficient background can undermine the rationale for the research, making it difficult to justify why the study is necessary or valuable.
• Misinterpretation : Lack of context can lead to misinterpretation of the research objectives, methods, and findings.

Example of Insufficient Background Information: In recent years, many researchers have studied the effects of social media on teenagers. This paper explores the relationship between social media use and anxiety among teenagers.

• Problem : This introduction lacks specific details about the previous research, the theoretical framework, and key terms. It does not provide enough context for the reader to understand why the study is important.

Example of Adequate Background Information: Social media platforms have become an integral part of teenagers’ daily lives, with studies showing that 95% of teens have access to a smartphone and 45% are online almost constantly. Previous research has linked excessive social media use to various mental health issues, including anxiety and depression. However, the mechanisms underlying this relationship remain unclear. This paper explores the impact of social media use on anxiety levels among teenagers, focusing on the roles of social comparison and cyberbullying.(4)

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• Review Relevant Literature : Summarize key studies and theories related to your topic.
• Provide Context : Explain the broader context of your research problem.
• Define Key Terms : Ensure that any specialized terms or concepts are clearly defined.
• Identify the Research Gap : Highlight what is not yet known or understood about your topic.
• Be Concise : Provide enough information to set the stage without overwhelming the reader with details.

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This mistake can occur when the literature review is too brief, lacks depth, omits key studies, or fails to critically analyze previous work. An inadequate literature review can undermine the foundation of the research by failing to provide the necessary context and justification for the study.

Inadequate Literature Review: There has been some research on the relationship between exercise and mental health. This paper will investigate this relationship further.

• Problem : This review is too general and does not provide sufficient detail about the existing research or how it informs the current study.

Example with Adequate Literature Review: Research has consistently shown that regular physical activity has positive effects on mental health. For example, a study by Gujral et al. (2019) demonstrated that aerobic exercise can significantly reduce symptoms of depression and anxiety. Similarly, Smith and Lee (2020) found that strength training also contributes to improved mood and reduced stress levels. However, much of the existing research has focused on adult populations, with relatively few studies examining these effects in adolescents. Additionally, the specific types of exercise that are most beneficial for different mental health outcomes have not been thoroughly investigated. This study aims to explore the effects of various types of exercise on the mental health of high school students, thereby addressing these gaps in the literature.(5-6)

• Be Comprehensive : Review a broad range of studies related to the research topic to provide a thorough context.
• Be Specific : Cite specific studies, including their methodologies, findings, and relevance to the current research.
• Be Critical : Analyze and evaluate the existing research, identifying strengths, weaknesses, and gaps.
• Be Structured : Organize the literature review logically, grouping studies by themes or findings to create a coherent narrative.
• Be Relevant : Focus on the most relevant studies that directly relate to the research question and objectives.

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Ignoring the research gap in a research paper introduction means failing to identify and articulate what specific aspect of the topic has not been explored or adequately addressed in existing literature. The research gap is a critical component because it justifies the necessity and originality of the study. Without highlighting this gap, the research may appear redundant or lacking in significance.

How huge is this mistake?

• Lack of Justification : The study may not appear necessary or relevant, diminishing its perceived value.
• Redundancy : The research may seem to duplicate existing studies, offering no new insights or contributions to the field. Even if you are using methodology similar to previous studies, it is important to note why you are doing so e.g., few studies have used that specific methodology, and you would like to validate it in your sample population!
• Reader Disinterest : Readers may lose interest if they do not see the unique contribution or purpose of the research.

Example of Ignoring the Research Gap: Many studies have examined the effects of exercise on mental health. This paper looks at the relationship between physical activity and depression.

• Problem : This introduction does not specify what aspect of the relationship between physical activity and depression has not been studied, failing to highlight the unique contribution of the research.

Example of Identifying the Research Gap: Numerous studies have demonstrated the general benefits of physical activity on mental health, particularly its role in alleviating symptoms of depression. However, there is limited research on how different types of exercise (e.g., aerobic vs. anaerobic) specifically impact depression levels among various age groups. This study investigates the differential effects of aerobic and anaerobic exercise on depression in young adults, aiming to fill this gap in the literature.(6)

• Conduct a Thorough Literature Review : Understand the current state of research in your field to identify what has been studied and where gaps exist.
• Be Specific : Clearly articulate what specific aspect has not been covered in existing studies.
• Link to Your Study : Explain how your research will address this gap and contribute to the field.
• Use Evidence : Support your identification of the gap with references to previous studies.
• Emphasize Significance : Highlight why filling this gap is important for advancing knowledge or practical applications.

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Overly technical language refers to the excessive use of jargon, complex terms, and highly specialized language that may be difficult for readers, especially those not familiar with the field, to understand. While technical language is sometimes necessary in academic writing, overusing it in the introduction can create several problems:

• Reader Alienation : Readers may find the text intimidating or inaccessible, leading to disengagement.
• Lack of Clarity : The main points and significance of the research can become obscured by complex terminology.
• Reduced Impact : The research may fail to communicate its importance effectively if readers struggle to understand the introduction.

Example of Overly Technical Language: The present study examines the metacognitive strategies employed by individuals in the domain of second language acquisition, specifically focusing on the interaction between declarative and procedural memory systems in the process of syntactic parsing.

• Problem : This sentence is loaded with jargon (“metacognitive strategies,” “second language acquisition,” “declarative and procedural memory systems,” “syntactic parsing”), which can be overwhelming and confusing for readers not familiar with these terms.

Example with Simplified Language: This study looks at the thinking strategies people use when learning a second language. It focuses on how different types of memory, such as the knowledge of facts and the skills for doing things, help in understanding sentence structures.(7)

• Know Your Audience : Tailor the language to the intended audience, ensuring it is accessible to both specialists and non-specialists.
• Define Term s: When technical terms are necessary, provide clear definitions or explanations.
• Use Analogies : Simplify complex concepts using analogies or examples that are easy to understand.
• Avoid Jargon : Limit the use of jargon and specialized terms, especially in the introduction.
• Seek Feedback : Ask peers or non-experts to read the introduction and provide feedback on clarity and accessibility.

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Poor organization and flow in a research paper introduction refer to a lack of logical structure and coherence that makes the introduction difficult to follow. This can occur when ideas are presented in a haphazard manner, transitions between sections are weak or non-existent, and the overall narrative is disjointed. A well-organized introduction should smoothly guide the reader from the general context to the specific objectives of the study.

Example of Poor Organization and Flow: “Climate change affects agriculture in various ways. Many studies have looked at the impact on crop yields. This paper will discuss the economic implications of these changes. Climate models predict increased variability in weather patterns, which will affect water availability. Researchers have found that higher temperatures reduce the growing season for many crops.”

• Problem : The ideas are presented in a scattered manner without clear connections. The mention of economic implications seems out of place, and there are abrupt shifts between topics.

Example with Good Organization and Flow: Climate change poses significant challenges to agriculture by altering weather patterns, impacting crop yields, and affecting water availability. Numerous studies have shown that increased temperatures can shorten the growing season for many crops, leading to reduced yields. Additionally, climate models predict increased variability in weather patterns, which complicates water management for farmers. These changes not only affect food production but also have substantial economic implications for agricultural communities. This paper will examine the economic impacts of climate-induced changes in agriculture, focusing on crop yield variability and water resource management.(1)

• Create an Outline : Before writing, outline the main points you want to cover in the introduction.
• Think in terms of an inverted triangle : Begin broadly to introduce basic concepts related to your topic. As you progress through the introduction, you can introduce more and more specific topics until you have enough information to justify your thesis statement
• Use Transitional Phrases : Employ transitional phrases and sentences to connect ideas and sections smoothly.
• Follow a Logical Sequence : Present information in a logical order, moving from general context to specific objectives.
• Maintain Focus : Stay focused on the main topic and avoid introducing unrelated ideas.
• Revise for Coherence : Review and revise the introduction to ensure that it flows well and that each part contributes to the overall narrative.

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Neglecting the audience refers to failing to consider the background, knowledge level, and interests of the intended readers when writing the introduction of a research paper. This mistake can manifest in several ways, such as using overly technical language for a general audience, providing insufficient background information for readers unfamiliar with the topic, or failing to engage the readers’ interest.

Example of Neglecting the Audience: For experts in genomic sequencing, this study explores the epigenetic modifications resulting from CRISPR-Cas9 interventions, focusing on the methylation patterns and histone modifications observed in gene-edited cells.

• Problem : This introduction assumes a high level of expertise in genomic sequencing and epigenetics, which may alienate readers without this background.

Example with Audience Consideration: CRISPR-Cas9 is a groundbreaking tool in genetic research that allows scientists to edit DNA with precision. However, altering genes can lead to unexpected changes in how genes are expressed, known as epigenetic modifications. This study investigates these changes by looking at specific markers on DNA, such as methylation patterns, and how they affect gene activity in cells that have been edited using CRISPR-Cas9. Our goal is to understand the broader implications of gene editing on cellular functions, which is crucial for advancing medical research and treatments.(8)

• Identify the Audience : Determine who the intended readers are (e.g., experts, students, general public) and tailor the language and content accordingly. Read papers from the journals you are considering for submission. Professional editors curate the language used in these papers and are a great starting point to identify the level of expertise of your audience!
• Simplify Language : Use clear and straightforward language, avoiding jargon and technical terms unless they are necessary and well-explained.
• Provide Background Information : Include sufficient background information to help readers understand the context and significance of the research.
• Engage the Reader : Start with an engaging introduction that highlights the relevance and importance of the research topic.
• Anticipate Questions : Consider what questions or concerns the audience might have and address them in the introduction

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By following these guidelines and avoiding common pitfalls, you can create an introduction that not only grabs the attention of your readers but also sets the stage for a compelling and impactful research paper.

Final Tips:

• Revise and refine your introduction multiple times to ensure clarity and coherence.
• Seek feedback from peers, mentors, or advisors to identify areas for improvement.
• Keep your audience in mind and tailor your language and content to their needs and interests.
• Stay focused on your research objectives and ensure that every part of your introduction contributes to achieving them.
• Be confident in the significance of your research and its potential impact on your field or community.

Let your introduction be more than just words on a page. It’s a doorway to understanding. To help you along, we’ve created a practical course on writing and publishing research projects. It’s 100% risk-free, with a money-back guarantee if you’re not satisfied. Try it out now by clicking here .

Wishing you success on your research journey!

Marina Ramzy Mourid, Hamza Ibad, MBBS

Dr. Ibad graduated from the Aga Khan University Medical College and completed a post-doctoral research fellowship at Johns Hopkins in the Department of Radiology (Musculoskeletal Division). Dr. Ibad’s research and clinical interests include deep-learning applications for automated image interpretation, osteoarthritis, and sarcopenia-related health outcomes.

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About thematchguy, become a researcher in the united states, interested in learning more about literature search with examples from published literature, the comprehensive research course, the systematic review course, the medical statistics course, how to find research positions in the us.

1. Abbass K, Qasim MZ, Song H, Murshed M, Mahmood H, Younis I. A review of the global climate change impacts, adaptation, and sustainable mitigation measures. Environ Sci Pollut Res. 2022;29(28):42539-42559. doi:10.1007/s11356-022-19718-6

2. Cai X, Wang D, Laurent R. Impact of climate change on crop yield: a case study of rainfed corn in central illinois. Journal of Applied Meteorology and Climatology. 2009;48(9):1868-1881. doi:10.1175/2009JAMC1880.1

3. Van Den Eijnden RJJM, Geurts SM, Ter Bogt TFM, Van Der Rijst VG, Koning IM. Social media use and adolescents’ sleep: a longitudinal study on the protective role of parental rules regarding internet use before sleep. IJERPH. 2021;18(3):1346. doi:10.3390/ijerph18031346

4. Schmitt, M. (2021). Effects of social media and technology on adolescents: What the evidence is showing and what we can do about it. Journal of Family and Consumer Sciences Education, 38(1), 51-59.

5. Gujral S, Aizenstein H, Reynolds CF, Butters MA, Erickson KI. Exercise effects on depression: Possible neural mechanisms. General Hospital Psychiatry. 2017;49:2-10. doi:10.1016/j.genhosppsych.2017.04.012

6. Smith PJ, Merwin RM. The role of exercise in management of mental health disorders: an integrative review. Annu Rev Med. 2021;72(1):45-62. doi:10.1146/annurev-med-060619-022943

7. Sun Q, Zhang LJ. Understanding learners’ metacognitive experiences in learning to write in English as a foreign language: A structural equation modeling approach. Front Psychol. 2022;13:986301. doi:10.3389/fpsyg.2022.986301

8. Kolanu ND. Crispr–cas9 gene editing: curing genetic diseases by inherited epigenetic modifications. Glob Med Genet. 2024;11(01):113-122. doi:10.1055/s-0044-1785234

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• Citation Styles

How to write an introduction for a research paper

Writing an introduction for a research paper can be one of the hardest parts of the writing process. How do you get started? In this post, we discuss the components of an introduction and explore strategies for writing one successfully.

What is an introduction?

The introduction to a research paper provides background information or context on the topic. It also includes the thesis statement and signposts that let the reader know what you will cover in the rest of the paper.

Depending on the type of research paper that you’re writing, you may also include a brief state of the field in your introduction. You might also put that in a separate section, called a literature review. Before you tackle writing your introduction, be sure to consult the assignment guidelines for your paper.

How to write an introduction

An introduction provides an overview of your topic and any background information that your readers need to know in order to understand the context. It generally concludes with an explicit statement of your position on the topic, which is known as your thesis statement.

The opening section

Many papers begin with a hook: a short anecdote or scenario that draws the reader in and gives a hint of what the paper will cover. A hook allows you to capture your reader’s attention and provides an anchor for the context that you will provide in the bulk of the introduction.

Most of your introduction should be taken up with background information, but this doesn’t mean that you should fill your opening section with overly general statements. Instead, provide key pieces of information (like statistics) that a reader would need to know in order to understand your main argument.

The thesis statement

Towards the end of the introduction, you should state your thesis, preferably in the form of "I argue that..." or "This paper argues that..." or a similar phrase. Although it’s called a “thesis statement,” your thesis can be more than one sentence.

Finally, an introduction contains a brief outline or "signposts" of what the rest of the article will cover (also known as forecasting statements). You can use language like, “in what follows,” or “in the rest of the paper,” to signal that you are describing what you’ll do in the remainder of the paper.

Tips for writing an introduction

1. don’t rely on generalizations.

An introduction is not simply filler. It has a very specific function in a research paper: to provide context that leads up to a thesis statement.

You may be tempted to start your paper with generalizations like, “many people believe that...” or, “in our society...,” or a general dictionary definition, because you’re not sure what kind of context to provide. Instead, use specific facts like statistics or historical anecdotes to open your paper.

2. State your thesis directly

Once you’ve provided the appropriate, and specific, background information on your topic, you can move on to stating your thesis. As a rule of thumb, state your thesis as directly as possible. Use phrases like “I argue that..” to indicate that you are laying out your main argument.

3. Include signposts

A strong introduction includes clear signposts that outline what you will cover in the rest of the paper. You can signal this by using words like, “in what follows,” and by describing the steps that you will take to build your argument.

4. Situate your argument within the scholarly conversation

Some types of research papers require a separate literature review in which you explore what others have written about your topic.

Even if you’re not required to have a formal literature review, you should still include at least a paragraph in which you engage with the scholarly debate on your chosen subject. Be sure to include direct quotes from your sources . You can use BibGuru’s citation generator to create accurate in-text citations for your quotes.

This section can come directly before your thesis statement or directly after it. In the former case, your state of the field will function as additional context for your thesis.

Frequently Asked Questions about how to write an introduction for a research paper

A good introduction provides specific background information on your topic, sets up your thesis statement, and includes signposts for what you’ll cover in the rest of the paper.

An introduction should include context, a thesis statement, and signposts.

Do not include generalizations, apologies for not being an expert, or dictionary definitions in your introduction.

The length of your introduction depends on the overall length of your paper. For instance, an introduction for an 8-10 page paper will likely be anywhere from 1-3 pages.

You can choose to start an introduction with a hook, an important statistic, an historical anecdote, or another specific piece of background information.

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Speaker 1: After the title page and abstract, the reader's first true interaction with your research paper is the introduction. Your introduction will establish the foundation upon which your readers approach your work, and if you use the tips we discuss in this video, these readers should be able to logically apply the rules set in your introduction to all parts of your paper, all the way through the conclusion. What exactly is the purpose of the introduction? Think about your paper as a chronological story. It will begin at point A, the introduction, and move in time towards point B, the discussion and conclusion. Since your introduction includes content about the gaps in knowledge that your study aims to fill, the results you elaborate on in your discussion section should therefore be somewhat familiar to the reader, as you have already touched upon them in the introduction section. The introduction must answer two main questions. Why was this particular study needed to fill the gaps in knowledge? And why does this particular gap need filling? Imagine our entire plane of knowledge as an incomplete puzzle. The pieces snapped together are what is established, or what is known. The missing piece is the gap in knowledge, or what is currently unknown. This is what your study will be helping to explain. So the context you provide in the introduction must first identify that there is a knowledge gap in what it is, it must explain why it needs to be filled, and then briefly summarize how this study intends to fill that gap and why. The introduction is one of the most compact parts of the research paper, since it is not very long but needs to essentially give a complete overview of the context in which your study is taking place, and your specific reasons for doing the study. Most tend to be around 10% of the total length of your paper. The introduction consists of background information about a topic being studied, the rationale for undertaking the study, or for filling the gap with this particular information, key references to preliminary work or closely related papers appearing elsewhere, a clarification of important terms, definitions, or abbreviations to be used in the paper, and a review of related studies in which you give a brief but incisive analysis of work that heavily concerns your study. It could be a very similar study or one that supports the findings of your new study. So how should you structure your introduction? As you can see in this figure, your introduction should start broadly and then narrow until it reaches your hypothesis. The first thing you want to do is state your area of research and then immediately show what is already known. This is also known as background information. Then move on to what is unknown, the problem or gap you want to resolve. Finally, you should discuss how you will resolve this problem using a clear hypothesis. In step one, you will show what is already known. Start with a strong statement that reflects your research subject area and ask questions or post statements to frame the problems your study explores. You can ask general questions here to guide your readers to the problem and show them what we already know. For instance, what do we know about breathing capability of bottlenose dolphins? Use keywords from your title, the exact language of your study that is, to zero in on the problem at hand and show the relevance of your work. Avoid stating background information that is too broad in nature. You don't need to state too many obvious facts that your readers would know. If you are writing about bottlenose dolphins, for instance, you probably don't need to explain to them that mammals breathe oxygen. At the beginning of the introduction, you should also be sure to cite all of the sources that you use for background information and support. Only provide the necessary background information. Don't focus extensively on background, but use it to set up the context for doing this study. You should also review only relevant, up-to-date primary literature that supports your explanation of our current base of knowledge. In the second part of your introduction, you should answer the question, what is the knowledge gap? Here you will highlight areas where too little information is available. Explain how and why we should fill in that gap. What does this missing information do to impede our understanding of a process or system? And you should identify what logical next steps can be developed based on existing research. By showing you have examined current data and devised a method to find new applications and make new inferences, you're showing your peers that you are aware of the direction your research is moving in, and you're showing confidence in your decision to pursue this paper study. In the last part of your introduction, you will show how your study fills in the knowledge gap. This is where you state your purpose and give a clear hypothesis or objective of the study. The hypothesis is a very short 1-2 sentence supposition or explanation of what will happen in your study. This is quite often written as an if-then format. If X and Y are present, then Z will occur. Here you should also try to answer the question, if we fill this gap, what useful information will the readers gain? Many researchers have difficulty when it comes to deciding when to write their introduction. It is important to consider the order you draft your research paper, for as you recall, everything else in the research paper must flow from the introduction. Therefore, because it is one of the most difficult sections to nail down, consider writing the introduction second to last, after the materials and methods, results, and discussion section, and just before the conclusion. This will ensure you effectively lay a groundwork for the rest of your paper, and you can use the research you have already compiled to ensure that everything in your introduction is pertinent and accurate. In addition to content and organization, writers of research papers should also be aware of grammar and style issues that directly affect the readability and strength of their printed work. Here are some guidelines for writing the introduction section. Try and write in the active voice when possible. This will shorten your sentences and enhance the impact of your information. Always strive for concise sentences. This will allow you to get in all of the necessary information in this compact introduction section. Use stronger verbs when possible. This also impacts sentence length and strength of writing. Be careful not to overuse first-person pronouns such as I and we, and always organize your thoughts from the broad to the specific, as we have seen in our model. A strong introduction will encourage readers to read your entire research paper and help get your work published in scientific journals. For more information and tips on manuscript writing and journal submissions, visit the resources page at wordvice.com.

Example introduction for a research paper

Molecular fluorine F2 is the most electronegative of the elements and therefore is imtroduction reactive. These sentences will form the entire thesis that you will explore research paper outline builder the dxample example introduction for a research paper in the rest of the paper. Introduction That Needs Example introduction for a research paper xeample an Edample Ecology Lab : Researchers studying global warming foe an increase in average global temperature of 1. First sentences hook readers, the mid part of the introduction prove the reason of the research and thesis statement puts debatable intrlduction that needs further analysis and right solution. In fact, a great intro is even more important for your success! You will also not find it hard explaining the rest of the research paper to the panellists. Although some tips will be more suited to papers in certain fields, the points are broadly applicable. The intro is the first thing that a reader sees. Research paper introduction in academic writing is widely used in the presentation of a thesis and academic work. These could be separate words or word combinations which define your topic. Sample sentence extracts complete introduction is 11 pages. H3: Career stages do not influence organizational commitment. For manipulative experiments, the hypothesis should include the independent variable what you manipulatethe dependent variable s what you measurethe organism or systemthe direction of your results, and comparison to be made. When is it due? Its minimal property implies that the network must be a tree…. It is exactly what helps him or her gets the first impression of your work, which carries their opinion about the merits of your paper while they finish reading it. It also outlines the methodological approach touching the likely outcomes that your study can reveal, and describing the remaining structure of the research paper. Indicate why you are disagreeing with the particular argument and what your standpoint is.

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• Your manuscript contains grammatical errors.  For example, on page 3, you used “their” when you should  have used “there.”
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Unless otherwise specified in the email your received from the editors, you may choose whether or not to make any suggested changes.  However, even if you do not change something that has been suggested, you must still address the suggestion in your response, and you must provide a compelling argument for your decision.

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Additionally, you should:

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Frequently asked questions

What should i include in a research paper introduction.

The introduction of a research paper includes several key elements:

• A hook to catch the reader’s interest
• Relevant background on the topic
• Details of your research problem

and your problem statement

• A thesis statement or research question
• Sometimes an overview of the paper

Frequently asked questions: Writing a research paper

A research project is an academic, scientific, or professional undertaking to answer a research question . Research projects can take many forms, such as qualitative or quantitative , descriptive , longitudinal , experimental , or correlational . What kind of research approach you choose will depend on your topic.

The best way to remember the difference between a research plan and a research proposal is that they have fundamentally different audiences. A research plan helps you, the researcher, organize your thoughts. On the other hand, a dissertation proposal or research proposal aims to convince others (e.g., a supervisor, a funding body, or a dissertation committee) that your research topic is relevant and worthy of being conducted.

Formulating a main research question can be a difficult task. Overall, your question should contribute to solving the problem that you have defined in your problem statement .

However, it should also fulfill criteria in three main areas:

• Researchability
• Feasibility and specificity
• Relevance and originality

Research questions anchor your whole project, so it’s important to spend some time refining them.

In general, they should be:

• Focused and researchable
• Answerable using credible sources
• Complex and arguable
• Feasible and specific
• Relevant and original

All research questions should be:

• Focused on a single problem or issue
• Researchable using primary and/or secondary sources
• Feasible to answer within the timeframe and practical constraints
• Specific enough to answer thoroughly
• Complex enough to develop the answer over the space of a paper or thesis
• Relevant to your field of study and/or society more broadly

A research aim is a broad statement indicating the general purpose of your research project. It should appear in your introduction at the end of your problem statement , before your research objectives.

Research objectives are more specific than your research aim. They indicate the specific ways you’ll address the overarching aim.

Once you’ve decided on your research objectives , you need to explain them in your paper, at the end of your problem statement .

Keep your research objectives clear and concise, and use appropriate verbs to accurately convey the work that you will carry out for each one.

I will compare …

Your research objectives indicate how you’ll try to address your research problem and should be specific:

Research objectives describe what you intend your research project to accomplish.

They summarize the approach and purpose of the project and help to focus your research.

Your objectives should appear in the introduction of your research paper , at the end of your problem statement .

The main guidelines for formatting a paper in Chicago style are to:

• Use a standard font like 12 pt Times New Roman
• Use 1 inch margins or larger
• Apply double line spacing
• Indent every new paragraph ½ inch
• Include a title page
• Place page numbers in the top right or bottom center
• Cite your sources with author-date citations or Chicago footnotes
• Include a bibliography or reference list

To automatically generate accurate Chicago references, you can use Scribbr’s free Chicago reference generator .

The main guidelines for formatting a paper in MLA style are as follows:

• Use an easily readable font like 12 pt Times New Roman
• Set 1 inch page margins
• Include a four-line MLA heading on the first page
• Center the paper’s title
• Use title case capitalization for headings
• Cite your sources with MLA in-text citations
• List all sources cited on a Works Cited page at the end

To format a paper in APA Style , follow these guidelines:

• Use a standard font like 12 pt Times New Roman or 11 pt Arial
• If submitting for publication, insert a running head on every page
• Apply APA heading styles
• Cite your sources with APA in-text citations
• List all sources cited on a reference page at the end

No, it’s not appropriate to present new arguments or evidence in the conclusion . While you might be tempted to save a striking argument for last, research papers follow a more formal structure than this.

All your findings and arguments should be presented in the body of the text (more specifically in the results and discussion sections if you are following a scientific structure). The conclusion is meant to summarize and reflect on the evidence and arguments you have already presented, not introduce new ones.

The conclusion of a research paper has several key elements you should make sure to include:

• A restatement of the research problem
• A summary of your key arguments and/or findings
• A short discussion of the implications of your research

Don’t feel that you have to write the introduction first. The introduction is often one of the last parts of the research paper you’ll write, along with the conclusion.

This is because it can be easier to introduce your paper once you’ve already written the body ; you may not have the clearest idea of your arguments until you’ve written them, and things can change during the writing process .

The way you present your research problem in your introduction varies depending on the nature of your research paper . A research paper that presents a sustained argument will usually encapsulate this argument in a thesis statement .

A research paper designed to present the results of empirical research tends to present a research question that it seeks to answer. It may also include a hypothesis —a prediction that will be confirmed or disproved by your research.

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Towards the Automation of Non-destructive Fault Recognition: Enhancement of Robustness and Accuracy Through AI Powered Acoustic and Thermal Signal Analysis in Time, Frequency- and Time-Frequency Domains

• Original Research Article
• Open access
• Published: 10 September 2024

Cite this article

You have full access to this open access article

• Sebastian Brand 1 ,
• Frank Altmann 1 ,
• Christian Grosse 1 ,
• Michael Kögel 1 ,
• Christian Hollerith 2 &
• Pascal Gounet 3  

Non-destructive inspection and analysis techniques are crucial for quality assessment and defect analysis in various industries. They enable for screening and monitoring of parts and products without alteration or impact, facilitating the exploration of material interactions and defect formation. With increasing complexity in microelectronic technologies, high reliability, robustness and thus, successful failure analysis is essential. Machine learning (ML) approaches have been developed and evaluated for the analysis of acoustic echo signals and time-resolved thermal responses for assessing their ability for defect detection. In the present paper different ML architectures were evaluated, including 1D and 2D convolutional neural networks (CNNs) after transforming time domain data into the spectral- and wavelet domains. Results showed that 2D CNNs processing data in wavelet domain representation performed best, however at the expense of additional computational effort. Furthermore, ML-based analysis was explored for lock-in thermography to detect and locate defects in the axial dimension based on thermal emissions. While promising, further research is needed to fully realize its potential.

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• Artificial Intelligence

Avoid common mistakes on your manuscript.

Introduction

Nondestructively operating inspection- and analysis techniques represent an essential instance in the quality assessment and failure analysis chain. Due to the nondestructive character inspected parts and components remain unaltered allowing for screening and monitoring of features and conditions. Therefore, monitoring capabilities are highly valuable when investigating the formation and propagation of anomalies which may transform into a defect, thus supporting the exploration of the interaction of the involved materials and their structures under common and exceptional conditions. With the continuously increasing level of assistance and automation across the industrial, automotive and consumer sector high reliability expectations meet increasingly complex power- and microelectronic components and systems. For ensuring the stated performance and the required safety of electronic products, defect affinity, -evolvement, and -propagation need to be investigated and understood. Besides repetitive analyses for research and exploration purposes, broad range inspection abilities with accurate recognition performance are key to quality assessment and monitoring, inevitable for high reliability and premium products. Against this background, the high complexity of electronic components, the potential requirement of a high-throughput inspection, the aim for nondestructivity, and the necessity of high-accuracy detections meet, resulting in an extended amount of data that need to be analyzed at an elevated performance level.

Due to its nondestructive mode of operation, microscopic acoustic imaging is a widely used technique for defect inspection in quality assessment, technology development and failure analysis. Depending on the specimen’s individual material properties it allows for lateral resolutions on the order of hundreds of microns down to the single digit micron-range. Its contrast mechanism is based on the interaction of an insonated acoustic pulsed wave with the sample’s internal materials and their acoustic properties, respectively. Caused by continuously decreasing feature sizes along with an increasing material variety in such devices the incident signal gets reflected and scattered resulting in echo signals commonly containing trains of individual but distorted pulses. Interpretation of such signals, which are received by the acoustic transducer becomes increasingly difficult, requiring profound expertise of the machine operator. Previous studies have positively evaluated the potential of machine learning for an operator independent analysis of acoustic echo signals for the purpose of increasing inspection reliability and the level of automation for defect detection and localization in quality assessment and failure analysis [ 1 , 2 , 3 , 4 , 5 ]. Some of these studies have employed 1D convolutional neural network architectures for analyzing the shape of the acoustic signals in time domain [ 1 , 2 ]. The present work is a continuation of those studies that extends the analysis from the pure time domain to the spectral and wavelet domains and the model architectures from 1D to 2D. Even though the information contained in the time signals is equal, representation in spectral—and wavelet domain may provide additional degrees of freedom which have the potential to contribute towards an increased performance and robustness of the analyses. In [ 2 ] it was reported that signal distortion caused by even slight defocusing of the acoustic transducer, highly decreased the classification accuracy and thus compromised the defect detection ability when analyzing flip chip devices. The present study also addressed these shortcomings and investigated the performance of 1D and 2D CNN network architectures when signals recorded at varying defocus were included into the training data. Furthermore, the concepts developed for acoustic microscopy-based analyses were extended and applied to the transient thermal responses to electrical excitation recorded in lock-in thermography for quantitatively and qualitatively estimating the depth of buried thermally active electrical defects.

Materials and Methods

Analysis of acoustic microscopy data.

Scanning acoustic microscopy was conducted on three individual sample sets and echo signals have been acquired in time domain for further processing and evaluation of ML-based analyses for operator independent and automated signal classification for defect detection.

Description of Samples and Equipment

Acoustic data from two sets of nonmolded flip chip samples and a power device (thin-die setup) have been acquired. Samples in “Set-I” contained flip chips with an edge length of the Si-die of 6 × 7 mm and a thickness of 350 µm. Flip chip bumps of this sample type were 50 µm in lateral diameter with a pitch of 135 µm. The samples of “Set-II” were flip chip devices with an edge length of the Si-die of 7 × 7 mm and a thickness of 85 µm. The flip chip bumps of these samples were 80 and 120 µm, respectively at varying pitch. Both sample sets were purposely taken out from the manufacturing process prior to applying underfill material between the Si-die and the PCB-substrate. Severe stressing for induction of accelerated aging and subsequent defect formation due to thermo-mechanical forces was conducted on the samples of “Set-I” and “Set-II”. To induce defects in the flip chip contacts samples of “Set-II” were placed alternately in boiling water and liquid nitrogen to generate sufficient thermo-mechanical stress to initiate bump-fractures. Samples of “Set-I” were extracted from reliability testing, where they underwent multiple flip chip attach reflow cycles in which samples are exposed to temperature gradients between room temperature and 240 °C. Devices in the sample “Set-III” were power devices which contained a thin Si-die glued onto a metal backplate. The die-attach contained delaminated areas which resulted in a decreased electrical and thermal conductivity. Due to the thin Si-thicknesses, a 2.4 mm 200 MHz acoustic transducer was employed for data acquisition for the sample Sets “I” and “III”, while a 3.2 mm focal length 200 MHz transducer was used for inspection and signal acquisition of sample “Set-II”. Acoustic excitation was performed using a commercial pulser/receiver unit DPR 500, JSR Ultrasonics Pittforth NY, USA. Received signals were digitized at a rate of 1GS/s and a resolution of 8bit using a M3i.21xx-x8-ADC, Spectrum Instrumentation GmbH, Grosshansdorf, Germany. Scanning was performed using a commercial 3-axis scanner to which the transducer was mounted.

Signal Pre-processing and ML-Based Analysis

In the spectral domain frequency related amplitudes and their distribution in the frequency band of the analyzed signal are represented. The spectrum of a time series of measurements can be computed through the Fourier transformation and is complex valued. Even though the information contained in the spectrum is the same as in the representation in time domain, an interpretation of the spectral characteristics may allow for a more distinct interpretation since it represents the signal in terms of periodicities and thus may allow for a more accurate class assignment. In the left column Fig.  1 contains the acoustic time domain signals received from three distinct objects of a flip chip device of a sample of “Set-I”. These objects are Top: a fractured bump, vertical center: an intact bump and in the Bottom row: a signal from a location with an underfill delamination. The center column of Fig.  1 contains the spectral representation of the signals shown in the Left column. To have the spectra contain temporal information, the real part and the imaginary part of the complex valued spectra have been summed. This signal processing will be referred to as “real + imag” in the remainder of this paper. A more intuitive way for signal representation in the spectral domain would be in terms of power distribution as a function of frequency. The power would be computed from the absolute values of the complex valued spectrum, which would erase all temporal information. This, however, was considered non-beneficial for the current purpose of class assignment of the acoustic signals, so the “real + imag” computation, as described above was chosen instead.

Preparation of training data for investigating the influence of the data representation domain onto the achievable accuracy and performance of 1D- and 2D model architectures. LEFT COLUMN: Acoustic echo signals obtained by SAM from: TOP: a defective flip chip bump, VERTICAL CENTER: an intact flip chip bump and BOTTOM: an underfill delamination. Graphs in the HORIZONTALLY CENTRAL COLUMN show the linear spectra (Real + Imaginary part of the FFT) of the signals in the LEFT COLUMN. 2D-maps in RIGHT COLUMN show the wavelet coefficients obtained from the signals in the LEFT COLUMN through continuous wavelet transformation

Two different types of 1D architectures have been trained for classification of the acoustic signals into four classes. These classes where: “defective Bumps”, intact Bumps”, “delamination of underfill” and “background/undefined”. It has been previously observed that the number of misclassifications can substantially be reduced when providing a separate class for signals that do not belong to one of the other classes and thus it was decided in the present work to consider these observations. For the 1D architectures the input layer was of dimension one. In the first type of architecture an image input layer of dimension [1, #of_samplepoints_in_signal, 1] was employed. However, this input layer did not allow for complex valued input signals. Therefore, the “real + imag” processing of the spectrum was conducted to maintain temporal information, of complex valued data, as elaborated above. The second type of 1D architecture contained a sequential input layer, which allowed for the use of complex valued data. Here the complex spectra obtained from Fourier transformation were employed as training data. Both 1D-networks contained three convolutional blocks followed by a global-max-pooling layer and two fully connected layers with a classification layer as the output. In the following, analyses based on the 1D architecture with the image input layer are referred to as “FFT (real + imag)”, while the analyses with the 1D network containing the sequential input layer are referred to as “FFT (complex)”.

A more explicit, however redundant signal representation can be obtained in the time-frequency domain. Here signal spectra are plotted versus the time axis and thus the temporal distribution of the spectral content is exhibited explicitly. In the present study signals underwent a continuous wavelet transformation (CWT) using the Morse wavelet prior to ML-processing. For each signal this transformation provides a two-dimensional map of the wavelet coefficients versus time and frequency, as shown in the right column in Fig.  1 . In the CWT-maps the variation of the spectral shape for a signal is contained as a function of time. The shape of an acoustic signal directly corresponds to the interaction of the acoustic wave with the sample. Therefore, with the CWT minor deviations in the shape of a time signal are presented time-resolved in the more explicit representation of the spectral domain, which results in a two-dimensional representation in the time-frequency domain. The maps in Fig.  1 illustrate the distinct differences between the shapes of the wavelet coefficients of the signals recorded from the three different objects.

For processing such two-dimensional matrices, a machine learning architecture requires a two-dimensional input layer. The model employed here was a modified version of the GoogleNet model [ 6 ]. This is a pretrained model designed for recognition of structures and shapes in two-dimensional image maps and is expected to be predestined for characterization and classification of the wavelet matrices obtained from the acoustic signals through CWT. The dropout layer “pool5-drop_7×7_s1” of the GoogleNET model was replaced by a dropout layer with weighting of 0.6. Also, the classification layer “loss3-classifier” and the output layers were modified according to the number of classes of the individual training data sets.

Figure  2 shows a summary of the processing and analysis flow of the acoustics-related part of this study. SAM data acquired from the three sample sets were transformed to the spectral- and wavelet domain, respectively and then separately used for training the three in Fig.  2 shown ML-learning approaches/models. For benchmarking and performance comparison the 1D (real + imag) network was also trained and analyzed using unprocessed signals in time domain. Performance assessment of the individual ML-based analysis approaches and ML-models was realized through the classification results obtained from applying labeled test data to the trained models.

Concept of the machine learning based acoustic analysis. For three different case studies acoustic data were acquired and stored. Unprocessed rf-signals, where then either transformed into the frequency and time-frequency domain, respectively. Following this transformed data were used for training of different machine learning models in 1D and 2D

Lock-In Thermography Data Acquisition and ML-Analysis

Lock-in thermography is a highly sensitive technique for the detection and localization of weak thermal sources which correspond to electrically conductive, but resistive defects. Its sensitivity reaches down to several µW of dissipated power. While, due to the application of highly magnifying infrared optics a high lateral resolution down to the range below 10 µm can be achieved, a precise localization in the axial dimension can still be difficult to obtain. In novel microelectronic systems three-dimensional interconnect structures and multi-chip assemblies highly challenge precise defect localization for further physical failure analysis. The present study investigates the applicability of a machine learning based analyses of thermal signals for the estimation of the beneath-surface depth of a buried thermally active defect. Pursued here were two approaches of machine learning based analysis. The first aims at performing classification-based analyses to assign the thermal source to an axial region (e.g., die-interfaces) at increasing depths. The second approach employed a regression-based analysis to quantitatively derive the depth of the thermal source underneath the sample surface. As shown in Fig.  3 the same models have been employed for analyzing the time-resolved thermal responses as were used for the acoustic analyses. For deriving quantitative depth estimates the terminal layer in all three models was replaced by a regression layer.

Concept of the machine learning based analysis of TRTR-signals acquired by LIT for depth localization of thermal sources

Sample Description and Used Equipment

The setup employed for the experimental work was an in house modified lock-in thermography system of the type ELITE, ThermoFisher Scientific, Fremont, CA, USA. The modifications enabled the acquisition of the transient thermal signals for post processing and machine learning based analyses. Investigated were samples of bulk monocrystalline Si of increasing thickness to obtain thermal transients of the increasing propagation lengths to generate pathlength related variations in the thermal signal for mimicking stacked-die assemblies. It should be noted that this sample was chosen to fundamentally investigate the general applicability of machine learning related signal analysis for defect-depth localization however, with limitations. The samples backsides were coated by Pt and thermal sources have been created through needle probing and the application of an electrical current of differing strength and frequencies.

Data Pre-processing

Due to its transparency in the infrared range artifacts in the experimental data have been observed resulting from the interference of the conducted and radiated thermal components. For compensation of these artifacts acquired transient thermal signals have been decomposed into its source signals by conducting independent component analysis (ICA) as previously described by Kögel [ 7 ] and then recombined without the radiation related component aiming at the suppression of the radiated part in the resulting signal. All machine learning based analysis approaches have been performed on the raw and the ICA—preprocessed versions of the thermal signals resulting in a total of 12 trainings and test-analyses as shown in Fig.  3 . Following this the above-described pre-processing steps using fast-Fourier- and continuous wavelet transformation, respectively have then been performed on the signals.

Employed Software and Toolboxes

All analyses, processing and computations were conducted in MATLAB, The Mathworks Inc., Natick, MA, USA. Custom software has been developed in house to enable convenient and intuitive data management of the acoustic and thermographic data, signal extraction and preprocessing. Besides the signal- and image processing toolboxes the license included MATLAB’s deep learning toolbox which formed the foundation for the development and evaluation of the machine learning based analysis approaches shown here.

Results and Discussion

The purpose of the work underlying the present paper is the development of machine learning based solutions and the evaluation of their potential for the analysis of transient measurement data with respect to their application for interpretation and classification in the context of nondestructive defect identification and localization in complex microelectronic packages. Furthermore, the study aims at investigating the analysis performances of different model architectures for the analysis of signals obtained from differing samples and inspection methods. The methods addressed here are acoustic microscopy and lock-in thermography. The following section presents and discusses the results obtained with the materials and methods described above.

Acoustic Microscopy Analysis

The investigations related to acoustic analysis included the inspection of three different sample sets (2× different types of flip chips, 1× thin-die power device), three different model architectures (2× 1-D, 1× 2-D), three (four) different methods of pre-processing (none, 2× FFT, 1× CWT) plus the investigation of the robustness behavior upon defocus related signal distortion and the effect of inclusion of corresponding signals in the training sequence.

Performance Comparison of Model Architectures and Pre-processing

As shown above, sequences of measurement data can be represented in different domains without changing the information content. Figure  4 contains the Test-accuracies of all model architectures employed here for classification of acoustic signal data. Values obtained from the data of the individual sample sets are grouped. Test-accuracies obtained from the previously trained models using the unprocessed signal in time domain data are represented by the blue bars in all three groups. Orange indicated are the Test-accuracies obtained when signals were preprocessed using the fast Fourier transform (FFT) and adding the real and imaginary parts. The yellow stained bar represents the Test-accuracies when the model was fed the complex-valued spectra obtained from the FFT. In the latter three cases the models had the same complexity they only differed in the type of the input layer. For the complex valued spectra, the model’s input layer was a sequential input layer, while for the two others the model contained an image input layer. In both cases the input layer received the data in one dimensional vectors. The fourth bar in each group, colored purple, shows the test-accuracy that was obtained with the data of each sample type from the modified GoogleNet architecture. Here, a continuous wavelet transform was applied to each signal prior to training and analysis, which resulted in a two-dimensional representation of the wavelet correlation coefficients over time- and frequency. The GoogleNet model, developed and pretrained for shape-recognition in 2-D images contained a 2D input layer which allowed handling the maps of wavelet coefficients. Figure  4 shows the lowest values of the test-accuracy when the signals that were to be processed were in the time domain. In all three samples the models that learned and classified the signals in frequency domain showed an almost equal performance regardless of the input layer type (image versus sequential), but a slightly better performance than processing the signals in time domain. Also, in all cases using the GoogleNet model and performing the training and analysis in 2D highest Test-accuracies were observed. It should be noticed that for the samples of “Set-II” (“FC type II”) all four models performed similarly well with Test-accuracy values above 99%. Observed, but not shown here was, that the computational effort was substantially higher for the 2D analysis, which can be explained by the higher complexity of the GoogleNet model. Therefore, in situations, where computational performance is an issue, it would be recommended to perform classification after fast Fourier transformation of the signals employing a model with a 1D input dimension.

Comparison of classification performances of 1D- and 2D CNN architectures for the two different types of flip chip samples and the power device analyzed here. Left: Test Accuracies obtained with sample “Set -I”. Center: Test Accuracies obtained with sample “Set-II”. Right: Test Accuracies obtained with sample “Set-III”. For all sample sets models trained with preprocessed data (spectral and wavelet domain) showed Test Accuracies higher than 90%. Values above bars are in [%]. Analyses of unprocessed data showed lowest performance values

Figures  5 and 6 exemplarily show the results of the signal classification using the trained 2D-GoogleNet model for a flip chip sample of “Set-I” and a power device of “Set-III”. In both images the map of classifications with the highest probability of the class assignment is superimposed onto the acoustic microscopy image computed from the signal energy. In Fig.  5 red-stained pixels indicate, where the model assigned the signal to the class “Defective Bump”. Green indication corresponds to an assignment to the class “Intact Bump”. As shown in the methods section, the models were trained on four classes. This approach followed a previous observation [ 2 ] that the introduction of dedicated classes for separate structures largely decrease the number of misclassifications. To keep the map intuitive, the classes “No Bump” and “Background” are blanked in Fig.  5 . Figure  6 contains the classification result for the detection of delamination defects in a power device of sample “Set-III”. The graph on the left exhibits the acoustic image, the center graph shows the classification map with green pixels indicating an intact interface and red corresponding to a delaminated interface region. The graph on the right in Fig.  6 contains the certainty map of the classifications in the center graph. High certainty values are observed in more homogeneous regions and fluctuation occur in areas that are rather nonhomogeneous. This is likely explained by signals at edges between delaminated and adhering regions containing varying signal shapes. Such signals on the other hand are not represented in the training data with the same occurrence as signals from the central regions of the individual classes and thus not used in the training to same extend. A common procedure to handle such issue is to blank results that correspond to classifications that have a certainty value below a defined reliability threshold.

ML-based automated detection of bump fractures employing the 2D-CNN approach using the modified GoogleNet model. Example was taken from sample “Set-I”. Classification was performed in four classes: “Defective Bump”, “Intact Bump”, “no Bump” and “undefined”. Red indication corresponds to defective bumps and green to intact bumps, while the other two classes were blanked (Color figure online)

Results of the ML-based acoustic analysis for the detection and classification of delamination defects in a power device from sample Set-III. LEFT: Acoustic image of the device. CENTER: Classification map with green indicating adhesion and red-delamination. RIGHT: Certainty map of the classifications in the CENTER graph (Color figure online)

Defect Detection Performance Upon Defocus Related Signal Distortion

A reduced classification certainty and an increased number of misclassifications has previously been observed when the transducer-sample distance varied between individual data acquisitions [ 2 ]. Since, in a production or testing environment multiple operators conduct the data analysis, an increased likelihood of the unintended occurrence of such deviation is expected. For this reason, it has been investigated, whether the classification robustness upon defocusing-caused signal distortion can be increased when defocused data are included during the training procedure. Figure  7 contains the results of these investigations for data recorded from a flip chip sample of “Set-II”. Data acquisition has been conducted at six different transducer-sample spacings and data were labeled and included in the training of all three models. The defocusing varied between + 290 and − 390 µm, where negative values correspond to the transducer moving closer to the sample surface. Since, the 1D models showed nearly identical Test-accuracies, only the results of the 1D real+ imag—model and thee 2D-modifed GoogleNet model are provided to keep the figure intuitive. The graphs in the left column in Fig.  7 show the acoustic micrographs of the same region of a sample of “Set-II”, however, recorded with different defocus. Also, the illustration is limited to the outermost defocus positions to illustrate the classification behavior at the most extreme signal distortion. It can be seen in the left column that the appearance and sharpness of the bumps and the under-die structures in the acoustic micrographs vary upon the defocus. The second column from the left in Fig.  7 contains the classification results obtained by the 1D model employing the real plus imaginary part of the Fourier transformed of the signal superimposed onto the acoustic micrograph. The third column from the left contains the results of the 2D-modfied GoogleNet model in the same representation. In these graphs green indicates intact bumps, red corresponds to defective bumps and magenta shows underfill delaminations (trapped air underneath the die). Similar to the representation in Fig.  5 the additional classes are blanked to keep the images clear and intuitive. The colorful graphs in the fourth column from the left contain the certainty values obtained for each pixel using the 2D-GoogleNet model. Red indicates a high certainty, while yellow–green–blue correspond to decreasing values in that order. Certainty values below 85% are blanked since they are not used for indication here. It is noticeable that the defect bumps are correctly classified regardless of the defocus the signals have been recorded with. Also, the delaminated spot is clearly detected by both models over all defocus positions. However, the 2D model seem to perform less accurate upon the defocus, as “intact-Bump” assignments are made outside the bump structures. It is also noticeable that the rim of the defective bumps (bottom-left in the images) is classified as intact, while these bumps are clearly defective. It seems that the 2D modified GoogleNet model shows an affinity towards misclassification into the class “intact Bump”. The rightmost column in Fig.  7 illustrates the pulse distortion that occurs upon defocusing the acoustic lens. The signals were recorded from a defective bump and major alterations in the signal shape can be recognized upon the defocus, which challenges the robustness of the classification. The results shown in Fig.  7 clearly show an increase in the classification robustness of defocus related distortions when the training data contain signals that exhibit such variation in the signals shape .

Defect detection employing distorted signals. The 1D ML based analysis (with FFT signal preprocessing) was investigated. Signals have been acquired with increasing defocus starting at 500 µm above the focus until 600 µm beyond the focus. LEFT: Map of the signal energy; second COLUMN FROM LEFT: Classification map obtained using the 1D (real + imag) processing superimposed on energy image—green: intact bump, red: defective bump, magenta: delamination, background classification has been blanked. Third COLUMN FROM LEFT: Classification map obtained using the 2D modified GoogleNet Model and the CWT-processing superimposed on energy image—green: intact bump, red: defective bump, magenta: delamination, background classification has been blanked. Second COLUMN FROM RIGHT: classification certainty maps of the 1D model results—all bumps have been classified with certainty values near 100%. Right: Signals of a defective bump illustrating signal distortion upon defocusing. TOP-RIGHT: 290 µm above interface in focus, RIGHT-VERTICAL CENTER: Interface in focus; BOTTOM-RIGHT: 390 µm closer than interface in focus (Color figure online)

Lock-In Thermography

Lock-in thermography is a highly sensitive technique for the detection and localization of even minor electrical dysfunction when accompanied by thermal emissions. As three-dimensional architectures, become increasingly relevant in microelectronics the defect localization needs to also extend to the third dimension. Previous approaches employed the temporal delay between electrical excitation and the reception of the thermal emissions in terms of phase to pinpoint the defect as the thermal source in depth [ 8 , 9 ]. While, this approach is generally valid, the practical application requires complex calibration and shown knowledge about the samples structure in order to obtain a precise depth estimate. The present research investigated the general applicability of machine learning based approaches to pinpoint defect related sources of thermal emission in the depth dimension inside a specific sample. Evaluated for this purpose were the three ML models (2× 1D, 1× 2D) as shown above. Equally to the acoustic data analysis time-resolved thermal responses were preprocessed by fast Fourier transformation and applied to the 1D model architecture and continuous wavelet transformed into the time-frequency domain for the 2D modified GoogleNet model, respectively. In extension to the previously described ML-based analyses the models have additionally been varied by implementation of a regression output layer (versus classification output layer) for directly deriving quantitative depth estimates. Figure  8 contains the results of the evaluation of both, the classification- and the regression-based analyses of all three models. The graph at the Top shows the Test-accuracies, for the classification. Here, the signals had to be assigned to one of six depth-classes. It can be noted that the 1D based analyses exhibited a considerably lower accuracy compared to the 2D based model. Since, Si is largely transparent in the infrared band is expected that thermal radiation emitted at the thermal source propagated directly through the sample interfering with the conducted component that irradiates at the sample surface. To investigate, whether this interference causes the low accuracy values, the raw TRTR signals have been decomposed using independent component analysis (ICA) [ 7 ] to remove the signal components that are related to the direct radiation. The results of the classification of the ICA-processed signals are on the right in the Top graph in Fig.  8 . In the classification case the results obtained with the 1D models appear rather inconsistent, however classification using the 2D model with an accuracy close to 90% seems promising. The bottom graph in Fig.  8 shows the root-mean-squared-error (RSME) of the regression analysis in [µm]. Here a low value of the RSME corresponds to a higher accuracy. While for the 1D models an accuracy of 16–17 µm can be achieved the 2D model allows for a classification accuracy of 5–6 µm. For failure localization in a stacked device the results of all models should be acceptable, since the accuracies lie within the thickness of a common Si-die. In Fig.  9 results of the application of a test data set to the regression models are shown in detail. The upper two graphs contain the predictions made by the 1D models, while the bottom diagram shows the predictions of the 2D model. The dashed red lines indicate equality between label and prediction and would thus correspond to 0 µm RMSE or 100% accuracy. From these graphs the trend of the false predictions can be seen. In a nonlinear manner the 1D models underestimate the actual depths. The 2D modified GoogleNet model however exhibits an almost linear relation between label and prediction although with a certain variance. These graphs suggest that a prediction using the 2D model may be sufficiently reliable for a quantitative depth estimation of the thermal source in the mono-Si bulk sample. However, further research is necessary to transfer these findings into a practical application.

Results of the Model Tests on labeled data, which the model has not encountered during training. Data have been left raw and preprocessed to remove IR-radiation related signal components. TOP: Results of assigning signals into one of six depth classes. BOTTOM: Results of the regression analysis for quantitatively estimating the depth

Results of the predictions obtained from the three trained regression models employing test data. TOP: Test results of the model with the 1D image input layer. CENTER: Test results of the model containing the sequential input layer. BOTTOM: Test results obtained with the 2D modified GoogleNet model. The dashed line indicates equality between input and output and would correspond to 100% accuracy

Summary and Conclusions

The paper describes the development, application and evaluation of machine learning based signal analysis in 1D and 2D for nondestructive defect detection, identification and localization in failure analysis of microelectronic components. The methods addressed are acoustic microscopy and lock-in thermography. The potential of the approach is demonstrated by four case studies including automated bump inspection in flip chip devices and delamination recognition in a power device containing a thin Si-die by high resolution acoustic analysis. Furthermore, the quantitative localization of the depth of a thermally active defect using lock-in thermography through both, classification and regression was investigated. While for the acoustics-related analysis the potential is quite evident, a reliable application of machine learning for the application in lock-in thermography although promising, still requires further research.

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Acknowledgements

The present work was partially conducted within the FA4.0- and the iREL4.0 project. The authors acknowledge financial funding from the European- and the German authorities through the EUREKA clusters EURIPIDES and PENTA from the “Bundesministerium für Bildung und Forschung” under Grant Number 16ME0109 and through the ECSEL JU under Grant No. 876659.

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This article is an invited paper selected from presentations at the 49th International Symposium for Testing and Failure Analysis (ISTFA 2023), held November 12–16, 2023 in Phoenix, Arizona, USA. The manuscript has been expanded from the original presentation. The special issue was organized by Dr. Vincent Immler, Oregon State University and Dr. Navid Asadi, University of Florida.

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Brand, S., Altmann, F., Grosse, C. et al. Towards the Automation of Non-destructive Fault Recognition: Enhancement of Robustness and Accuracy Through AI Powered Acoustic and Thermal Signal Analysis in Time, Frequency- and Time-Frequency Domains. J Fail. Anal. and Preven. (2024). https://doi.org/10.1007/s11668-024-02030-5

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Received : 15 February 2024

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Published : 10 September 2024

DOI : https://doi.org/10.1007/s11668-024-02030-5

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