how to write about a research gap

The Research Gap (Literature Gap)

Everything you need to know to find a quality research gap

By: Ethar Al-Saraf (PhD) | Expert Reviewed By: Eunice Rautenbach (DTech) | November 2022

If you’re just starting out in research, chances are you’ve heard about the elusive research gap (also called a literature gap). In this post, we’ll explore the tricky topic of research gaps. We’ll explain what a research gap is, look at the four most common types of research gaps, and unpack how you can go about finding a suitable research gap for your dissertation, thesis or research project.

Overview: Research Gap 101

• What is a research gap
• Four common types of research gaps
• Practical examples
• How to find research gaps
• Recap & key takeaways

What (exactly) is a research gap?

Well, at the simplest level, a research gap is essentially an unanswered question or unresolved problem in a field, which reflects a lack of existing research in that space. Alternatively, a research gap can also exist when there’s already a fair deal of existing research, but where the findings of the studies pull in different directions , making it difficult to draw firm conclusions.

For example, let’s say your research aims to identify the cause (or causes) of a particular disease. Upon reviewing the literature, you may find that there’s a body of research that points toward cigarette smoking as a key factor – but at the same time, a large body of research that finds no link between smoking and the disease. In that case, you may have something of a research gap that warrants further investigation.

Now that we’ve defined what a research gap is – an unanswered question or unresolved problem – let’s look at a few different types of research gaps.

Types of research gaps

While there are many different types of research gaps, the four most common ones we encounter when helping students at Grad Coach are as follows:

• The classic literature gap
• The disagreement gap
• The contextual gap, and
• The methodological gap

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1. The Classic Literature Gap

First up is the classic literature gap. This type of research gap emerges when there’s a new concept or phenomenon that hasn’t been studied much, or at all. For example, when a social media platform is launched, there’s an opportunity to explore its impacts on users, how it could be leveraged for marketing, its impact on society, and so on. The same applies for new technologies, new modes of communication, transportation, etc.

Classic literature gaps can present exciting research opportunities , but a drawback you need to be aware of is that with this type of research gap, you’ll be exploring completely new territory . This means you’ll have to draw on adjacent literature (that is, research in adjacent fields) to build your literature review, as there naturally won’t be very many existing studies that directly relate to the topic. While this is manageable, it can be challenging for first-time researchers, so be careful not to bite off more than you can chew.

2. The Disagreement Gap

As the name suggests, the disagreement gap emerges when there are contrasting or contradictory findings in the existing research regarding a specific research question (or set of questions). The hypothetical example we looked at earlier regarding the causes of a disease reflects a disagreement gap.

Importantly, for this type of research gap, there needs to be a relatively balanced set of opposing findings . In other words, a situation where 95% of studies find one result and 5% find the opposite result wouldn’t quite constitute a disagreement in the literature. Of course, it’s hard to quantify exactly how much weight to give to each study, but you’ll need to at least show that the opposing findings aren’t simply a corner-case anomaly .

3. The Contextual Gap

The third type of research gap is the contextual gap. Simply put, a contextual gap exists when there’s already a decent body of existing research on a particular topic, but an absence of research in specific contexts .

For example, there could be a lack of research on:

• A specific population – perhaps a certain age group, gender or ethnicity
• A geographic area – for example, a city, country or region
• A certain time period – perhaps the bulk of the studies took place many years or even decades ago and the landscape has changed.

The contextual gap is a popular option for dissertations and theses, especially for first-time researchers, as it allows you to develop your research on a solid foundation of existing literature and potentially even use existing survey measures.

Importantly, if you’re gonna go this route, you need to ensure that there’s a plausible reason why you’d expect potential differences in the specific context you choose. If there’s no reason to expect different results between existing and new contexts, the research gap wouldn’t be well justified. So, make sure that you can clearly articulate why your chosen context is “different” from existing studies and why that might reasonably result in different findings.

4. The Methodological Gap

Last but not least, we have the methodological gap. As the name suggests, this type of research gap emerges as a result of the research methodology or design of existing studies. With this approach, you’d argue that the methodology of existing studies is lacking in some way , or that they’re missing a certain perspective.

For example, you might argue that the bulk of the existing research has taken a quantitative approach, and therefore there is a lack of rich insight and texture that a qualitative study could provide. Similarly, you might argue that existing studies have primarily taken a cross-sectional approach , and as a result, have only provided a snapshot view of the situation – whereas a longitudinal approach could help uncover how constructs or variables have evolved over time.

Practical Examples

Let’s take a look at some practical examples so that you can see how research gaps are typically expressed in written form. Keep in mind that these are just examples – not actual current gaps (we’ll show you how to find these a little later!).

Context: Healthcare

Despite extensive research on diabetes management, there’s a research gap in terms of understanding the effectiveness of digital health interventions in rural populations (compared to urban ones) within Eastern Europe.

Context: Environmental Science

While a wealth of research exists regarding plastic pollution in oceans, there is significantly less understanding of microplastic accumulation in freshwater ecosystems like rivers and lakes, particularly within Southern Africa.

Context: Education

While empirical research surrounding online learning has grown over the past five years, there remains a lack of comprehensive studies regarding the effectiveness of online learning for students with special educational needs.

As you can see in each of these examples, the author begins by clearly acknowledging the existing research and then proceeds to explain where the current area of lack (i.e., the research gap) exists.

How To Find A Research Gap

Now that you’ve got a clearer picture of the different types of research gaps, the next question is of course, “how do you find these research gaps?” .

Well, we cover the process of how to find original, high-value research gaps in a separate post . But, for now, I’ll share a basic two-step strategy here to help you find potential research gaps.

As a starting point, you should find as many literature reviews, systematic reviews and meta-analyses as you can, covering your area of interest. Additionally, you should dig into the most recent journal articles to wrap your head around the current state of knowledge. It’s also a good idea to look at recent dissertations and theses (especially doctoral-level ones). Dissertation databases such as ProQuest, EBSCO and Open Access are a goldmine for this sort of thing. Importantly, make sure that you’re looking at recent resources (ideally those published in the last year or two), or the gaps you find might have already been plugged by other researchers.

Once you’ve gathered a meaty collection of resources, the section that you really want to focus on is the one titled “ further research opportunities ” or “further research is needed”. In this section, the researchers will explicitly state where more studies are required – in other words, where potential research gaps may exist. You can also look at the “ limitations ” section of the studies, as this will often spur ideas for methodology-based research gaps.

By following this process, you’ll orient yourself with the current state of research , which will lay the foundation for you to identify potential research gaps. You can then start drawing up a shortlist of ideas and evaluating them as candidate topics . But remember, make sure you’re looking at recent articles – there’s no use going down a rabbit hole only to find that someone’s already filled the gap 🙂

Let’s Recap

We’ve covered a lot of ground in this post. Here are the key takeaways:

• A research gap is an unanswered question or unresolved problem in a field, which reflects a lack of existing research in that space.
• The four most common types of research gaps are the classic literature gap, the disagreement gap, the contextual gap and the methodological gap. 
• To find potential research gaps, start by reviewing recent journal articles in your area of interest, paying particular attention to the FRIN section .

If you’re keen to learn more about research gaps and research topic ideation in general, be sure to check out the rest of the Grad Coach Blog . Alternatively, if you’re looking for 1-on-1 support with your dissertation, thesis or research project, be sure to check out our private coaching service .

Psst... there’s more!

This post was based on one of our popular Research Bootcamps . If you're working on a research project, you'll definitely want to check this out ...

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Home » Research Gap – Types, Examples and How to Identify

Research Gap – Types, Examples and How to Identify

Table of Contents

Research Gap

Definition:

Research gap refers to an area or topic within a field of study that has not yet been extensively researched or is yet to be explored. It is a question, problem or issue that has not been addressed or resolved by previous research.

How to Identify Research Gap

Identifying a research gap is an essential step in conducting research that adds value and contributes to the existing body of knowledge. Research gap requires critical thinking, creativity, and a thorough understanding of the existing literature . It is an iterative process that may require revisiting and refining your research questions and ideas multiple times.

Here are some steps that can help you identify a research gap:

• Review existing literature: Conduct a thorough review of the existing literature in your research area. This will help you identify what has already been studied and what gaps still exist.
• Identify a research problem: Identify a specific research problem or question that you want to address.
• Analyze existing research: Analyze the existing research related to your research problem. This will help you identify areas that have not been studied, inconsistencies in the findings, or limitations of the previous research.
• Brainstorm potential research ideas : Based on your analysis, brainstorm potential research ideas that address the identified gaps.
• Consult with experts: Consult with experts in your research area to get their opinions on potential research ideas and to identify any additional gaps that you may have missed.
• Refine research questions: Refine your research questions and hypotheses based on the identified gaps and potential research ideas.
• Develop a research proposal: Develop a research proposal that outlines your research questions, objectives, and methods to address the identified research gap.

Types of Research Gap

There are different types of research gaps that can be identified, and each type is associated with a specific situation or problem. Here are the main types of research gaps and their explanations:

Theoretical Gap

This type of research gap refers to a lack of theoretical understanding or knowledge in a particular area. It can occur when there is a discrepancy between existing theories and empirical evidence or when there is no theory that can explain a particular phenomenon. Identifying theoretical gaps can lead to the development of new theories or the refinement of existing ones.

Empirical Gap

An empirical gap occurs when there is a lack of empirical evidence or data in a particular area. It can happen when there is a lack of research on a specific topic or when existing research is inadequate or inconclusive. Identifying empirical gaps can lead to the development of new research studies to collect data or the refinement of existing research methods to improve the quality of data collected.

Methodological Gap

This type of research gap refers to a lack of appropriate research methods or techniques to answer a research question. It can occur when existing methods are inadequate, outdated, or inappropriate for the research question. Identifying methodological gaps can lead to the development of new research methods or the modification of existing ones to better address the research question.

Practical Gap

A practical gap occurs when there is a lack of practical applications or implementation of research findings. It can occur when research findings are not implemented due to financial, political, or social constraints. Identifying practical gaps can lead to the development of strategies for the effective implementation of research findings in practice.

Knowledge Gap

This type of research gap occurs when there is a lack of knowledge or information on a particular topic. It can happen when a new area of research is emerging, or when research is conducted in a different context or population. Identifying knowledge gaps can lead to the development of new research studies or the extension of existing research to fill the gap.

Examples of Research Gap

Here are some examples of research gaps that researchers might identify:

• Theoretical Gap Example : In the field of psychology, there might be a theoretical gap related to the lack of understanding of the relationship between social media use and mental health. Although there is existing research on the topic, there might be a lack of consensus on the mechanisms that link social media use to mental health outcomes.
• Empirical Gap Example : In the field of environmental science, there might be an empirical gap related to the lack of data on the long-term effects of climate change on biodiversity in specific regions. Although there might be some studies on the topic, there might be a lack of data on the long-term effects of climate change on specific species or ecosystems.
• Methodological Gap Example : In the field of education, there might be a methodological gap related to the lack of appropriate research methods to assess the impact of online learning on student outcomes. Although there might be some studies on the topic, existing research methods might not be appropriate to assess the complex relationships between online learning and student outcomes.
• Practical Gap Example: In the field of healthcare, there might be a practical gap related to the lack of effective strategies to implement evidence-based practices in clinical settings. Although there might be existing research on the effectiveness of certain practices, they might not be implemented in practice due to various barriers, such as financial constraints or lack of resources.
• Knowledge Gap Example: In the field of anthropology, there might be a knowledge gap related to the lack of understanding of the cultural practices of indigenous communities in certain regions. Although there might be some research on the topic, there might be a lack of knowledge about specific cultural practices or beliefs that are unique to those communities.

Examples of Research Gap In Literature Review, Thesis, and Research Paper might be:

• Literature review : A literature review on the topic of machine learning and healthcare might identify a research gap in the lack of studies that investigate the use of machine learning for early detection of rare diseases.
• Thesis : A thesis on the topic of cybersecurity might identify a research gap in the lack of studies that investigate the effectiveness of artificial intelligence in detecting and preventing cyber attacks.
• Research paper : A research paper on the topic of natural language processing might identify a research gap in the lack of studies that investigate the use of natural language processing techniques for sentiment analysis in non-English languages.

How to Write Research Gap

By following these steps, you can effectively write about research gaps in your paper and clearly articulate the contribution that your study will make to the existing body of knowledge.

Here are some steps to follow when writing about research gaps in your paper:

• Identify the research question : Before writing about research gaps, you need to identify your research question or problem. This will help you to understand the scope of your research and identify areas where additional research is needed.
• Review the literature: Conduct a thorough review of the literature related to your research question. This will help you to identify the current state of knowledge in the field and the gaps that exist.
• Identify the research gap: Based on your review of the literature, identify the specific research gap that your study will address. This could be a theoretical, empirical, methodological, practical, or knowledge gap.
• Provide evidence: Provide evidence to support your claim that the research gap exists. This could include a summary of the existing literature, a discussion of the limitations of previous studies, or an analysis of the current state of knowledge in the field.
• Explain the importance: Explain why it is important to fill the research gap. This could include a discussion of the potential implications of filling the gap, the significance of the research for the field, or the potential benefits to society.
• State your research objectives: State your research objectives, which should be aligned with the research gap you have identified. This will help you to clearly articulate the purpose of your study and how it will address the research gap.

Importance of Research Gap

The importance of research gaps can be summarized as follows:

• Advancing knowledge: Identifying research gaps is crucial for advancing knowledge in a particular field. By identifying areas where additional research is needed, researchers can fill gaps in the existing body of knowledge and contribute to the development of new theories and practices.
• Guiding research: Research gaps can guide researchers in designing studies that fill those gaps. By identifying research gaps, researchers can develop research questions and objectives that are aligned with the needs of the field and contribute to the development of new knowledge.
• Enhancing research quality: By identifying research gaps, researchers can avoid duplicating previous research and instead focus on developing innovative research that fills gaps in the existing body of knowledge. This can lead to more impactful research and higher-quality research outputs.
• Informing policy and practice: Research gaps can inform policy and practice by highlighting areas where additional research is needed to inform decision-making. By filling research gaps, researchers can provide evidence-based recommendations that have the potential to improve policy and practice in a particular field.

Applications of Research Gap

Here are some potential applications of research gap:

• Informing research priorities: Research gaps can help guide research funding agencies and researchers to prioritize research areas that require more attention and resources.
• Identifying practical implications: Identifying gaps in knowledge can help identify practical applications of research that are still unexplored or underdeveloped.
• Stimulating innovation: Research gaps can encourage innovation and the development of new approaches or methodologies to address unexplored areas.
• Improving policy-making: Research gaps can inform policy-making decisions by highlighting areas where more research is needed to make informed policy decisions.
• Enhancing academic discourse: Research gaps can lead to new and constructive debates and discussions within academic communities, leading to more robust and comprehensive research.

Advantages of Research Gap

Here are some of the advantages of research gap:

• Identifies new research opportunities: Identifying research gaps can help researchers identify areas that require further exploration, which can lead to new research opportunities.
• Improves the quality of research: By identifying gaps in current research, researchers can focus their efforts on addressing unanswered questions, which can improve the overall quality of research.
• Enhances the relevance of research: Research that addresses existing gaps can have significant implications for the development of theories, policies, and practices, and can therefore increase the relevance and impact of research.
• Helps avoid duplication of effort: Identifying existing research can help researchers avoid duplicating efforts, saving time and resources.
• Helps to refine research questions: Research gaps can help researchers refine their research questions, making them more focused and relevant to the needs of the field.
• Promotes collaboration: By identifying areas of research that require further investigation, researchers can collaborate with others to conduct research that addresses these gaps, which can lead to more comprehensive and impactful research outcomes.

Disadvantages of Research Gap

While research gaps can be advantageous, there are also some potential disadvantages that should be considered:

• Difficulty in identifying gaps: Identifying gaps in existing research can be challenging, particularly in fields where there is a large volume of research or where research findings are scattered across different disciplines.
• Lack of funding: Addressing research gaps may require significant resources, and researchers may struggle to secure funding for their work if it is perceived as too risky or uncertain.
• Time-consuming: Conducting research to address gaps can be time-consuming, particularly if the research involves collecting new data or developing new methods.
• Risk of oversimplification: Addressing research gaps may require researchers to simplify complex problems, which can lead to oversimplification and a failure to capture the complexity of the issues.
• Bias : Identifying research gaps can be influenced by researchers’ personal biases or perspectives, which can lead to a skewed understanding of the field.
• Potential for disagreement: Identifying research gaps can be subjective, and different researchers may have different views on what constitutes a gap in the field, leading to disagreements and debate.

About the author

Muhammad Hassan

Researcher, Academic Writer, Web developer

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Write Like a Scientist

A Guide to Scientific Communication

Gap Statements

  A gap is something that remains to be done or learned in an area of research; it’s a gap in the knowledge of the scientists in the field of research of your study. Every research project must, in some way, address a gap–that is, attempt to fill in some piece of information missing in the scientific literature. Otherwise, it is not novel research and is therefore not contributing to the overall goals of science.

Identify the gap.

  A gap statement is found in the Introduction section of a journal article or poster or in the Goals and Importance section of a research proposal and succinctly identifies for your audience the gap that you will attempt to address in your project.

A gap might be a lack of understanding about how well a particular instrument works in a certain situation. It could be introducing a new method that needs to be tested. Or it could be that you are studying a whole new organism, system, or part of a process. Your project may also address multiple gaps, in which case you should be sure to identify each of them clearly!

In a class, you might not always be studying something brand “new.” But, in most cases, you should still try to come up with something unique about your project, however small. Talk to your professor about what they expect for your gap statement if nothing seems to work.

Here, the authors signal to us that this is a gap because they use the words “has not yet been clarified.” Other phrases that might help you identify (or form!) a gap statement are:

• …has/have not been… (studied/reported/elucidated)
• …is required/needed…
• …the key question is/remains…
• …it is important to address…

Fill the gap.

  Once you identify the gap in the literature, you must tell your audience how you attempt to at least somewhat address in your project this lack of knowledge or understanding . In a journal article or poster, this is often done in a new paragraph and should be accomplished in one summary statement, such as:

Therefore, the purpose of this study was to determine the effects of lead on the hepatobiliary system, especially on the liver and on the gallbladder (adapted from Sipos et al. 2003 ).

You’ll often find that the first sentence of the last paragraph in a paper’s introduction will start somewhat like this, indicating the gap fill.  

Remember–always keep your voice professional! Colloquial phrases such as “we looked into” or “we checked if” should be avoided when introducing your gap fill.

So let’s look at this idea in context by looking at some examples from a couple of types of papers. The gap statements are underlined; the fills are italicized.  

In the second and third examples, the gap may be a little less obvious–it doesn’t use any phrases to signal to you that there’s something missing, such as “has not been clarified” or “have not been reported.” But because of the way the paragraph is laid out–following the conventions of our move structures–we can see that the underlined section of text is indeed the missing information in the literature that the group sought to address in their project.

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• Writing Tips

How to Identify a Research Gap

5-minute read

• 10th January 2024

If you’ve been tasked with producing a thesis or dissertation, one of your first steps will be identifying a research gap. Although finding a research gap may sound daunting, don’t fret! In this post, we will define a research gap, discuss its importance, and offer a step-by-step guide that will provide you with the essential know-how to complete this critical step and move on to the rest of your research project.

What Is a Research Gap?

Simply put, a research gap is an area that hasn’t been explored in the existing literature. This could be an unexplored population, an untested method, or a condition that hasn’t been investigated yet. 

Why Is Identifying a Research Gap Important?

Identifying a research gap is a foundational step in the research process. It ensures that your research is significant and has the ability to advance knowledge within a specific area. It also helps you align your work with the current needs and challenges of your field. Identifying a research gap has many potential benefits.

1. Avoid Redundancy in Your Research

Understanding the existing literature helps researchers avoid duplication. This means you can steer clear of topics that have already been extensively studied. This ensures your work is novel and contributes something new to the field.

2. Guide the Research Design

Identifying a research gap helps shape your research design and questions. You can tailor your studies to specifically address the identified gap. This ensures that your work directly contributes to filling the void in knowledge.

3. Practical Applications

Research that addresses a gap is more likely to have practical applications and contributions. Whether in academia, industry, or policymaking, research that fills a gap in knowledge is often more applicable and can inform decision-making and practices in real-world contexts.

4. Field Advancements

Addressing a research gap can lead to advancements in the field . It may result in the development of new theories, methodologies, or technologies that push the boundaries of current understanding.

5. Strategic Research Planning

Identifying a research gap is crucial for strategic planning . It helps researchers and institutions prioritize areas that need attention so they can allocate resources effectively. This ensures that efforts are directed toward the most critical gaps in knowledge.

6. Academic and Professional Recognition

Researchers who successfully address significant research gaps often receive peer recognition within their academic and professional communities. This recognition can lead to opportunities for collaboration, funding, and career advancement.

How Do I Identify a Research Gap?

1. clearly define your research topic .

Begin by clearly defining your research topic. A well-scoped topic serves as the foundation for your studies. Make sure it’s not too broad or too narrow; striking the right balance will make it easier to identify gaps in existing literature.

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2. Conduct a Thorough Literature Review

A comprehensive literature review is a vital step in any research. Dive deep into the existing research related to your topic. Look for patterns, recurring themes, and consensus among scholars. Pay attention to areas where conflicting opinions or gaps in understanding emerge.

3. Evaluate Existing Studies

Critically evaluate the studies you encounter during your literature review. Assess the paradigms , methodologies, findings, and limitations of each. Note any discrepancies, unanswered questions, or areas where further investigation is warranted. These are potential indicators of research gaps.

4. Identify Unexplored Perspectives

Consider the perspectives presented in the existing literature. Are there alternative viewpoints or marginalized voices that haven’t been adequately explored? Identifying and incorporating diverse perspectives can often lead to uncharted territory and help you pinpoint a unique research gap.

Additional Tips

Stay up to date with emerging trends.

The field of research is dynamic, with new developments and emerging trends constantly shaping the landscape. Stay up to date with the latest publications, conferences, and discussions in your field and make sure to regularly check relevant academic search engines . Often, identifying a research gap involves being at the forefront of current debates and discussions.

Seek Guidance From Experts

Don’t hesitate to reach out to experts in your field for guidance. Attend conferences, workshops, or seminars where you can interact with seasoned researchers. Their insights and experience can provide valuable perspectives on potential research gaps that you may have overlooked. You can also seek advice from your academic advisor .

Use Research Tools and Analytics

Leverage tech tools to analyze patterns and trends in the existing literature. Tools like citation analysis, keyword mapping, and data visualization can help you identify gaps and areas with limited exploration.

Identifying a research gap is a skill that evolves with experience and dedication. By defining your research topic, meticulously navigating the existing literature, critically evaluating studies, and recognizing unexplored perspectives, you’ll be on your way to identifying a research gap that will serve as the foundation for your paper, thesis, or dissertation topic .

If you need any help with proofreading your research paper , we can help with our research paper editing services . You can even try a sample of our services for free . Good luck with all your research!

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Identifying Research Gaps to Pursue Innovative Research

This article is an excerpt from a lecture given by my Ph.D. guide, a researcher in public health. She advised us on how to identify research gaps to pursue innovative research in our fields.

What is a Research Gap?

Today we are talking about the research gap: what is it, how to identify it, and how to make use of it so that you can pursue innovative research. Now, how many of you have ever felt you had discovered a new and exciting research question , only to find that it had already been written about? I have experienced this more times than I can count. Graduate studies come with pressure to add new knowledge to the field. We can contribute to the progress and knowledge of humanity. To do this, we need to first learn to identify research gaps in the existing literature.

A research gap is, simply, a topic or area for which missing or insufficient information limits the ability to reach a conclusion for a question. It should not be confused with a research question, however. For example, if we ask the research question of what the healthiest diet for humans is, we would find many studies and possible answers to this question. On the other hand, if we were to ask the research question of what are the effects of antidepressants on pregnant women, we would not find much-existing data. This is a research gap. When we identify a research gap, we identify a direction for potentially new and exciting research.

How to Identify Research Gap?

Considering the volume of existing research, identifying research gaps can seem overwhelming or even impossible. I don’t have time to read every paper published on public health. Similarly, you guys don’t have time to read every paper. So how can you identify a research gap?

There are different techniques in various disciplines, but we can reduce most of them down to a few steps, which are:

• Identify your key motivating issue/question
• Identify key terms associated with this issue
• Review the literature, searching for these key terms and identifying relevant publications
• Review the literature cited by the key publications which you located in the above step
• Identify issues not addressed by  the literature relating to your critical  motivating issue

It is the last step which we all find the most challenging. It can be difficult to figure out what an article is  not  saying. I like to keep a list of notes of biased or inconsistent information. You could also track what authors write as “directions for future research,” which often can point us towards the existing gaps.

Different Types of Research Gaps

Identifying research gaps is an essential step in conducting research, as it helps researchers to refine their research questions and to focus their research efforts on areas where there is a need for more knowledge or understanding.

1. Knowledge gaps

These are gaps in knowledge or understanding of a subject, where more research is needed to fill the gaps. For example, there may be a lack of understanding of the mechanisms behind a particular disease or how a specific technology works.

2. Conceptual gaps

These are gaps in the conceptual framework or theoretical understanding of a subject. For example, there may be a need for more research to understand the relationship between two concepts or to refine a theoretical framework.

3. Methodological gaps

These are gaps in the methods used to study a particular subject. For example, there may be a need for more research to develop new research methods or to refine existing methods to address specific research questions.

4. Data gaps

These are gaps in the data available on a particular subject. For example, there may be a need for more research to collect data on a specific population or to develop new measures to collect data on a particular construct.

5. Practical gaps

These are gaps in the application of research findings to practical situations. For example, there may be a need for more research to understand how to implement evidence-based practices in real-world settings or to identify barriers to implementing such practices.

Examples of Research Gap

Limited understanding of the underlying mechanisms of a disease:.

Despite significant research on a particular disease, there may be a lack of understanding of the underlying mechanisms of the disease. For example, although much research has been done on Alzheimer’s disease, the exact mechanisms that lead to the disease are not yet fully understood.

Inconsistencies in the findings of previous research:

When previous research on a particular topic has inconsistent findings, there may be a need for further research to clarify or resolve these inconsistencies. For example, previous research on the effectiveness of a particular treatment for a medical condition may have produced inconsistent findings, indicating a need for further research to determine the true effectiveness of the treatment.

Limited research on emerging technologies:

As new technologies emerge, there may be limited research on their applications, benefits, and potential drawbacks. For example, with the increasing use of artificial intelligence in various industries, there is a need for further research on the ethical, legal, and social implications of AI.

How to Deal with Literature Gap?

Once you have identified the literature gaps, it is critical to prioritize. You may find many questions which remain to be answered in the literature. Often one question must be answered before the next can be addressed. In prioritizing the gaps, you have identified, you should consider your funding agency or stakeholders, the needs of the field, and the relevance of your questions to what is currently being studied. Also, consider your own resources and ability to conduct the research you’re considering. Once you have done this, you can narrow your search down to an appropriate question.

Tools to Help Your Search

There are thousands of new articles published every day, and staying up to date on the literature can be overwhelming. You should take advantage of the technology that is available. Some services include  PubCrawler ,  Feedly ,  Google Scholar , and PubMed updates. Stay up to date on social media forums where scholars share new discoveries, such as Twitter. Reference managers such as  Mendeley  can help you keep your references well-organized. I personally have had success using Google Scholar and PubMed to stay current on new developments and track which gaps remain in my personal areas of interest.

The most important thing I want to impress upon you today is that you will struggle to  choose a research topic  that is innovative and exciting if you don’t know the existing literature well. This is why identifying research gaps starts with an extensive and thorough  literature review . But give yourself some boundaries.  You don’t need to read every paper that has ever been written on a topic. You may find yourself thinking you’re on the right track and then suddenly coming across a paper that you had intended to write! It happens to everyone- it happens to me quite often. Don’t give up- keep reading and you’ll find what you’re looking for.

Class dismissed!

How do you identify research gaps? Share your thoughts in the comments section below.

Frequently Asked Questions

A research gap can be identified by looking for a topic or area with missing or insufficient information that limits the ability to reach a conclusion for a question.

Identifying a research gap is important as it provides a direction for potentially new research or helps bridge the gap in existing literature.

Gap in research is a topic or area with missing or insufficient information. A research gap limits the ability to reach a conclusion for a question.

Thank u for your suggestion.

Very useful tips specially for a beginner

Thank you. This is helpful. I find that I’m overwhelmed with literatures. As I read on a particular topic, and in a particular direction I find that other conflicting issues, topic a and ideas keep popping up, making me more confused.

I am very grateful for your advice. It’s just on point.

The clearest, exhaustive, and brief explanation I have ever read.

Thanks for sharing

Thank you very much.The work is brief and understandable

Thank you it is very informative

Thanks for sharing this educative article

Thank you for such informative explanation.

Great job smart guy! Really outdid yourself!

Nice one! I thank you for this as it is just what I was looking for!😃🤟

Thank you so much for this. Much appreciated

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Thank you so much .I’ved learn a lot from this.❤️

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Identifying the gap

Research involves highlighting the questions that remain unanswered in your area of research. This is often referred to as ‘identifying the gap’ in the literature and tells the reader what areas need further investigation in your research area. Identifying ‘the gap’ in your research is fundamental to finding your position in an ongoing conversation by deciding how much you accept, question, or reject the claims that your sources make.

When you start to write about that research, you need to figure out how to signal that position, as you quote, summarize, or paraphrase from your sources.

Read the following text and note the way the researcher identifies the gap in the research as a way of positioning themselves in the research field.

This research project sets out to discover if an experience of Antarctica, specifically mine, could be interpreted through the creation of souvenirs and jewellery. Although Antarctica is considered to be a very remote place it has a long and significant history of science and exploration and most recently has become the destination for tourism [a] . However, unlike most tourist destinations Antarctica has not been memorialised through jewellery and souvenirs in the way of historic tourist locations in the world [b]. Throughout Antarctica’s history explorers have painted images and more recently documented it through photography [c] . Whalers and fishermen have made their own representations of this isolated and uninhabited continent, however, none of these matches the proliferation of souvenirs that have been produced to provide memories and reminders of Europe for example during the times of the Grand Tour or the commonly available souvenirs of popular resorts, sites and locations today [d] .

Excerpt from Kirsten Haydon’s dissertation  Antarctic landscapes in the souvenir and jewellery  (used with permission)

Check your understanding

Research and Writing Skills for Academic and Graduate Researchers Copyright © 2022 by RMIT University is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License , except where otherwise noted.

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How to identify research gaps

Anthony Newman

About this video

Researching is an ongoing task, as it requires you to think of something nobody else has thought of before. This is where the research gap comes into play.

We will explain what a research gap is, provide you with steps on how to identify these research gaps, as well as provide you several tools that can help you identify them.

About the presenter

Senior Publisher, Life Sciences, Elsevier

Anthony Newman is a Senior Publisher with Elsevier and is based in Amsterdam. Each year he presents numerous Author Workshops and other similar trainings worldwide. He is currently responsible for fifteen biochemistry and laboratory medicine journals, he joined Elsevier over thirty years ago and has been Publisher for more than twenty of those years. Before then he was the marketing communications manager for the biochemistry journals of Elsevier.  By training he is a polymer chemist and was active in the surface coating industry before leaving London and moving to Amsterdam in 1987 to join Elsevier.

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• Research Process

What is a Research Gap

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Table of Contents

If you are a young researcher, or even still finishing your studies, you’ll probably notice that your academic environment revolves around certain research topics, probably linked to your department or to the interest of your mentor and direct colleagues. For example, if your department is currently doing research in nanotechnology applied to medicine, it is only natural that you feel compelled to follow this line of research. Hopefully, it’s something you feel familiar with and interested in – although you might take your own twists and turns along your career.

Many scientists end up continuing their academic legacy during their professional careers, writing about their own practical experiences in the field and adapting classic methodologies to a present context. However, each and every researcher dreams about being a pioneer in a subject one day, by discovering a topic that hasn’t been approached before by any other scientist. This is a research gap.

Research gaps are particularly useful for the advance of science, in general. Finding a research gap and having the means to develop a complete and sustained study on it can be very rewarding for the scientist (or team of scientists), not to mention how its new findings can positively impact our whole society.

How to Find a Gap in Research

How many times have you felt that you have finally formulated THAT new and exciting question, only to find out later that it had been addressed before? Probably more times than you can count.

There are some steps you can take to help identify research gaps, since it is impossible to go through all the information and research available nowadays:

• Select a topic or question that motivates you: Research can take a long time and surely a large amount of physical, intellectual and emotional effort, therefore choose a topic that can keep you motivated throughout the process.
• Find keywords and related terms to your selected topic: Besides synthesizing the topic to its essential core, this will help you in the next step.
• Use the identified keywords to search literature: From your findings in the above step, identify relevant publications and cited literature in those publications.
• Look for topics or issues that are missing or not addressed within (or related to) your main topic.
• Read systematic reviews: These documents plunge deeply into scholarly literature and identify trends and paradigm shifts in fields of study. Sometimes they reveal areas or topics that need more attention from researchers and scientists.

Keeping track of all the new literature being published every day is an impossible mission. Remember that there is technology to make your daily tasks easier, and reviewing literature can be one of them. Some online databases offer up-to-date publication lists with quite effective search features:

• Elsevier’s Scope
• Google Scholar

Of course, these tools may be more or less effective depending on knowledge fields. There might be even better ones for your specific topic of research; you can learn about them from more experienced colleagues or mentors.

Find out how FINER research framework can help you formulate your research question.

Literature Gap

The expression “literature gap” is used with the same intention as “research gap.” When there is a gap in the research itself, there will also naturally be a gap in the literature. Nevertheless, it is important to stress out the importance of language or text formulations that can help identify a research/literature gap or, on the other hand, making clear that a research gap is being addressed.

When looking for research gaps across publications you may have noticed sentences like:

…has/have not been… (studied/reported/elucidated) …is required/needed… …the key question is/remains… …it is important to address…

These expressions often indicate gaps; issues or topics related to the main question that still hasn’t been subject to a scientific study. Therefore, it is important to take notice of them: who knows if one of these sentences is hiding your way to fame.

Language Editing Services by Elsevier Author Services:

• Manuscript Review

Systematic Review VS Meta-Analysis

Literature Review in Research Writing

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Research Process

• Brainstorming
• Explore Google This link opens in a new window
• Explore Web Resources
• Explore Background Information
• Explore Books
• Explore Scholarly Articles
• Narrowing a Topic
• Primary and Secondary Resources
• Academic, Popular & Trade Publications
• Scholarly and Peer-Reviewed Journals
• Grey Literature
• Clinical Trials
• Evidence Based Treatment
• Scholarly Research
• Database Research Log
• Search Limits
• Keyword Searching
• Boolean Operators
• Phrase Searching
• Truncation & Wildcard Symbols
• Proximity Searching
• Field Codes
• Subject Terms and Database Thesauri
• Reading a Scientific Article
• Website Evaluation
• Article Keywords and Subject Terms
• Cited References
• Citing Articles
• Related Results
• Search Within Publication
• Database Alerts & RSS Feeds
• Personal Database Accounts
• Persistent URLs
• Literature Gap and Future Research
• Web of Knowledge
• Annual Reviews
• Systematic Reviews & Meta-Analyses
• Finding Seminal Works
• Exhausting the Literature
• Finding Dissertations
• Researching Theoretical Frameworks
• Research Methodology & Design
• Tests and Measurements
• Organizing Research & Citations This link opens in a new window
• Scholarly Publication
• Learn the Library This link opens in a new window

Research Articles

These examples below illustrate how researchers from different disciplines identified gaps in existing literature. For additional examples, try a NavigatorSearch using this search string: ("Literature review") AND (gap*)

• Addressing the Recent Developments and Potential Gaps in the Literature of Corporate Sustainability
• Applications of Psychological Science to Teaching and Learning: Gaps in the Literature
• Attitudes, Risk Factors, and Behaviours of Gambling Among Adolescents and Young People: A Literature Review and Gap Analysis
• Do Psychological Diversity Climate, HRM Practices, and Personality Traits (Big Five) Influence Multicultural Workforce Job Satisfaction and Performance? Current Scenario, Literature Gap, and Future Research Directions
• Entrepreneurship Education: A Systematic Literature Review and Identification of an Existing Gap in the Field
• Evidence and Gaps in the Literature on HIV/STI Prevention Interventions Targeting Migrants in Receiving Countries: A Scoping Review
• Homeless Indigenous Veterans and the Current Gaps in Knowledge: The State of the Literature
• A Literature Review and Gap Analysis of Emerging Technologies and New Trends in Gambling
• A Review of Higher Education Image and Reputation Literature: Knowledge Gaps and a Research Agenda
• Trends and Gaps in Empirical Research on Open Educational Resources (OER): A Systematic Mapping of the Literature from 2015 to 2019
• Where Should We Go From Here? Identified Gaps in the Literature in Psychosocial Interventions for Youth With Autism Spectrum Disorder and Comorbid Anxiety

What is a ‘gap in the literature’?

The gap, also considered the missing piece or pieces in the research literature, is the area that has not yet been explored or is under-explored. This could be a population or sample (size, type, location, etc.), research method, data collection and/or analysis, or other research variables or conditions.

It is important to keep in mind, however, that just because you identify a gap in the research, it doesn't necessarily mean that your research question is worthy of exploration. You will want to make sure that your research will have valuable practical and/or theoretical implications. In other words, answering the research question could either improve existing practice and/or inform professional decision-making (Applied Degree), or it could revise, build upon, or create theoretical frameworks informing research design and practice (Ph.D Degree). See the Dissertation Center  for additional information about dissertation criteria at NU.

For a additional information on gap statements, see the following:

• How to Find a Gap in the Literature
• Write Like a Scientist: Gap Statements

How do you identify the gaps?

Conducting an exhaustive literature review is your first step. As you search for journal articles, you will need to read critically across the breadth of the literature to identify these gaps. You goal should be to find a ‘space’ or opening for contributing new research. The first step is gathering a broad range of research articles on your topic. You may want to look for research that approaches the topic from a variety of methods – qualitative, quantitative, or mixed methods. 

See the videos below for further instruction on identifying a gap in the literature.

Identifying a Gap in the Literature - Dr. Laurie Bedford

How Do You Identify Gaps in Literature? - SAGE Research Methods

Literature Gap & Future Research - Library Workshop

This workshop presents effective search techniques for identifying a gap in the literature and recommendations for future research.

Where can you locate research gaps?

As you begin to gather the literature, you will want to critically read for what has, and has not, been learned from the research. Use the Discussion and Future Research sections of the articles to understand what the researchers have found and where they point out future or additional research areas. This is similar to identifying a gap in the literature, however, future research statements come from a single study rather than an exhaustive search. You will want to check the literature to see if those research questions have already been answered.

Roadrunner Search

Identifying the gap in the research relies on an exhaustive review of the literature. Remember, researchers may not explicitly state that a gap in the literature exists; you may need to thoroughly review and assess the research to make that determination yourself.

However, there are techniques that you can use when searching in NavigatorSearch to help identify gaps in the literature. You may use search terms such as "literature gap " or "future research" "along with your subject keywords to pinpoint articles that include these types of statements.

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Library Guide to Capstone Literature Reviews: Find a Research Gap

Find a research gap: tips to get started.

Finding a research gap is not an easy process and there is no one linear path. These tips and suggestions are just examples of possible ways to begin. 

In Ph.D. dissertations, students identify a gap in research. In other programs, students identify a gap in practice. The literature review for a gap in practice will show the context of the problem and the current state of the research. 

Research gap definition

A research gap exists when:

• a question or problem has not been answered by existing studies/research in the field 
• a concept or new idea has not been studied at all
• all the existing literature on a topic is outdated 
• a specific population/location/age group etc has not been studied 

A research gap should be:

• grounded in the literature
• amenable to scientific study
• Litmus Test for a Doctoral-Level Research Problem (Word) This tool helps students determine if they have identified a doctoral level research problem.

Identify a research gap

To find a gap you must become very familiar with a particular field of study. This will involve a lot of research and reading, because a gap is defined by what does (and does not) surround it.

• Search the research literature and dissertations (search all university dissertations, not just Walden!).
• Understand your topic! Review background information in books and encyclopedias . 
• Look for literature reviews, systematic reviews, and meta-analyses.
• Take notes on concepts, themes, and subject terms . 
• Look closely at each article's limitations, conclusions, and recommendations for future research. 
• Organize, analyze, and repeat! 

• Quick Answer: How do I find dissertations on a topic?

Start with broad searches

Use the Library Search (formerly Thoreau)  to do a broad search with just one concept at a time . Broad searches give you an idea of the academic conversation surrounding your topic.

• Try the terms you know (keywords) first.
• Look at the Subject Terms (controlled language) to brainstorm terms. 
• Subject terms help you understand what terms are most used, and what other terms to try.
• No matter what your topic is, not every researcher will be using the same terms. Keep an eye open for additional ways to describe your topic.
• Guide: Subject Terms & Index Searches: Index Overview

Keep a list of terms

• Create a list of terms
• Example list of terms

This list will be a record of what terms are: 

• related to or represent your topic
• synonyms or antonyms
• more or less commonly used
• keywords (natural language) or subject terms (controlled language)
• Synonyms & antonyms (database search skills)
• Turn keywords into subject terms

Term I started with:

culturally aware 

Subject terms I discovered:

cultural awareness (SU) 

cultural sensitivity (SU) 

cultural competence (SU) 

Search with different combinations of terms

• Combine search terms list
• Combine search terms table
• Video: Search by Themes

Since a research gap is defined by the absence of research on a topic, you will search for articles on everything that relates to your topic. 

• List out all the themes related to your gap.
• Search different combinations of the themes as you discover them (include search by theme video at bottom) 

For example, suppose your research gap is on the work-life balance of tenured and tenure-track women in engineering professions. In that case, you might try searching different combinations of concepts, such as: 

• women and STEM 
• STEM or science or technology or engineering or mathematics
• female engineering professors 
• tenure-track women in STEM
• work-life balance and women in STEM
• work-life balance and women professors
• work-life balance and tenure 

Topic adapted from one of the award winning Walden dissertations. 

• Walden University Award Winning Dissertations
• Gossage, Lily Giang-Tien, "Work-Life Balance of Tenured and Tenure-Track Women Engineering Professors" (2019). Walden Dissertations and Doctoral Studies. 6435.

Break your topic into themes and try combining the terms from different themes in different ways. For example: 

Theme 1 and Theme 4

Theme 2 and Theme 1

Theme 3 and Theme 4

Video: Search by Themes (YouTube)

(2 min 40 sec) Recorded April 2014 Transcript

Track where more research is needed

Most research articles will identify where more research is needed. To identify research trends, use the literature review matrix to track where further research is needed. 

• Download or create your own Literature Review Matrix (examples in links below).
• Do some general database searches on broad topics.
• Find an article that looks interesting.
• When you read the article, pay attention to the conclusions and limitations sections.
• Use the Literature Review Matrix to track where  'more research is needed' or 'further research needed'. NOTE:  you might need to add a column to the template.
• As you fill in the matrix you should see trends where more research is needed.

There is no consistent section in research articles where the authors identify where more research is needed. Pay attention to these sections: 

• limitations
• conclusions
• recommendations for future research 
• Literature Review Matrix Templates: learn how to keep a record of what you have read
• Literature Review Matrix (Excel) with color coding Sample template for organizing and synthesizing your research
• Previous Page: Scope
• Next Page: Get & Stay Organized
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Nadine Anderson, Behavioral Sciences and Women's & Gender Studies Librarian

Steps for identifying research gaps in the literature

Your Master's thesis should make a significant, novel contribution to the field. Your thesis hypothesis should address a  research gap which you identify in the literature, a research question or problem that has not been answered in your research area of interest. This shows that you have developed expertise in the body of knowledge and theoretical issues in your chosen research area. 

Step 1: Focus Your Research Area

Before you start trying to identify gaps in the literature, you need to figure out what your area of interest is, and then focus and narrow that research area. If you don't narrow down your initial research area of interest, you'll end up wanting to research everything. You'll overwhelm yourself with all the research gaps you find because there are still a lot of unanswered research questions out there. 

• Do some exploratory research  on your broad research idea in your course textbook, class notes, in meta-analysis, systematic, and literature reviews, and  PsycINFO  to identify more specific issues and arguments in your research area and possible relationships between them.
• Read ebooks  to get the "big picture" about the research area you're interested in studying. Books and ebooks provide detailed information on your research area, put your research area in context, provide summaries of research, and help you identify major themes and relationships for your study.
• Ask your advisors and other faculty  about possible topics or issues within your research area of interest. That being said, you're going to spend over a year immersed in work on your thesis, so make sure you  choose issues because you find them deeply interesting , not just because your advisor recommended them.

Step 2: Read, Read, and then Read Some More

Read (a lot of) research articles : this is going to be time-demanding, but you really do need to read through a lot of research articles in your research area to become an expert in it. That being said, what you use from the articles that you read should relate directly back to your focused research questions and hypothesis. Don't waste your time getting sidetracked by issues that don't relate to your research questions and hypothesis.

• Go to  Start Finding Sources ,  Search Databases , and  Browse Journals  to find journal articles for your research area
• Pay close attention to Introductions , in which authors explain why their research is important, and Suggestions for Future Research , in which authors point readers to areas which lack investigation or need future examination

Follow the research trails  of seminal articles and authors using Web of Science and Scopus:

• In Scopus , click on Document Search , enter the article title, click on the article title in the list of search hits, then click on View all ~ citing documents link in the right sidebar for a list of articles that have cited this article
• In Web of Science , enter the article title and choose Title from the right drop down menu , then click on the Times Cited number next to the article to see a list of articles that have cited this article
• In Scopus , click on Author Search , enter the last name and first initial(s) of the author, click on the author's name in the list of search hits, then click on Cited By ~ documents for a list of articles that have cited this author
• In Web of Science , enter the author name and choose Author from the right drop down menu , then click on the Times Cited number next to each article to see a list of articles that have cited this author's article

Read meta-analyses, literature reviews,  and  systematic reviews : these papers delve deep into the literature, examining the trends and changes over a long period of time in your research area and summaries of previous research findings.

• In PsycINFO , click on literature review, systematic review, and  meta analysis  under the Methodologies heading in the sidebar to the right of the list of search hits 
• In CINAHL , add systematic reviews to your search 
• In Web Of Science , check the box beside Review under the Document Type heading in the sidebar to the right of the list of search hits

Step 3: Map out the Literature :

Keep track of what the authors told you and the questions that occur to you whenever you read anything - an article, a book, a book chapter, a dissertation, etc. This will also help you write your thesis introduction later on and help you avoid  unconscious plagiarism .Some more tips:

• Use mind maps, tables, charts, pictures, post-it notes to map out the literature, whatever works for you. 
• Research each of your questions to see if there are people out there who had the same questions and found answers to them
• Science Direct , Web of Science , and Wiley Online Library databases help you follow the research trail by listing articles that have since cited the research article you're reading

If you find don't find any answers to one of your questions, you've probably found a research gap from which you can develop a thesis hypothesis and experimental project. Get feedback from your advisors before you get too carried away, though!

• Get started by considering your central thesis question 
• How do the sources you've found connect to that question and help you answer it?
• How do the sources connect to and build off of one another?
• << Previous: What Do Thesis Projects Involve?
• Next: Develop A Hypothesis >>
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What is a research gap.

A research gap is a question or a problem that has not been answered by any of the existing studies or research within your field. Sometimes, a research gap exists when there is a concept or new idea that hasn't been studied at all. Sometimes you'll find a research gap if all the existing research is outdated and in need of new/updated research (studies on Internet use in 2001, for example). Or, perhaps a specific population has not been well studied (perhaps there are plenty of studies on teenagers and video games, but not enough studies on toddlers and video games, for example). These are just a few examples, but any research gap you find is an area where more studies and more research need to be conducted. Please view this video clip from our Sage Research Methods database for more helpful information: How Do You Identify Gaps in Literature?

How do I find one?

It will take a lot of research and reading.  You'll need to be very familiar with all the studies that have already been done, and what those studies contributed to the overall body of knowledge about that topic. Make a list of any questions you have about your topic and then do some research to see if those questions have already been answered satisfactorily. If they haven't, perhaps you've discovered a gap!  Here are some strategies you can use to make the most of your time:

• One useful trick is to look at the “suggestions for future research” or conclusion section of existing studies on your topic. Many times, the authors will identify areas where they think a research gap exists, and what studies they think need to be done in the future.
• As you are researching, you will most likely come across citations for seminal works in your research field. These are the research studies that you see mentioned again and again in the literature.  In addition to finding those and reading them, you can use a database like Web of Science to follow the research trail and discover all the other articles that have cited these. See the FAQ: I found the perfect article for my paper. How do I find other articles and books that have cited it? on how to do this. One way to quickly track down these seminal works is to use a database like SAGE Navigator, a social sciences literature review tool. It is one of the products available via our SAGE Knowledge database.
• In the PsycINFO and PsycARTICLES databases, you can select literature review, systematic review, and meta analysis under the Methodology section in the advanced search to quickly locate these. See the FAQ: Where can I find a qualitative or quantitative study? for more information on how to find the Methodology section in these two databases.
• In CINAHL , you can select Systematic review under the Publication Type field in the advanced search. 
• In Web of Science , check the box beside Review under the Document Type heading in the “Refine Results” sidebar to the right of the list of search hits.
• If the database you are searching does not offer a way to filter your results by document type, publication type, or methodology in the advanced search, you can include these phrases (“literature reviews,” meta-analyses, or “systematic reviews”) in your search string.  For example, “video games” AND “literature reviews” could be a possible search that you could try.

Please give these suggestions a try and contact a librarian for additional assistance.

Content authored by: GS

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Writing the Introduction/Background of a Research Article

Writing the introduction and background of a research article can be daunting. Where do you start? What information should you include?

A great place to start is creating an argument structure for why your research topic is relevant and important. This structure should clearly walk the reader through current, relevant literature and lead them to the gap in the literature that your topic fills. To do this I use the following 4-step argument creation structure.

• Create argument funnel questions/statements
• Harvest article quotes that explain/backup each of the argument funnel questions/statements
• Organize article quotes to best support each section of the argument funnel
• Write prose that utilizes the article quotes to progress your argument from most well known to your specific topic

1. Argument Funnel Creation

Create an argument funnel with statements that take the reader form the most well known and widely accepted knowledge connected to my topic down to your specific research topic.

Completed Argument Funnel Example

When creating your funnel statements think about what research exists related to your topic. Where are the gaps in the existing literature? How do you know those are the gaps? If you get stuck, think about the 50,000 ft view of your topic and how you would explain the necessity of your research to people not in your field.

2. Harvesting Article Quotes

Find research articles that pertain to each of your funnel statements to back them up with evidence. As you find the articles put them into a citation manager (e.g., Zotero) now to save yourself time later. While reading the articles, pull (copy and paste) article quotes/excerpts that MAY be relevant. Pull more than you think you need, especially duplicates of the same idea by different authors to strengthen your argument. Store your quotes/excerpts in a document organized by your funnel statements with in-text citations with the page number you pulled it from. The National Academy of Engineering reports can be valuable top of funnel resources.

3. Organizing Article Quotes

Once you have harvested many article quotes for each of your funnel statements, organized them in an order that walks your reader through the literature landscape in a logical way. As you do this assume the reader doesn’t know anything about your topic so start at the beginning. Chronological order is a good place to start but may not always fit your argument. Think about your quotes/excerpts as puzzle pieces, where do they logically fit together?

4. Writing Prose

Now that your article quotes are organized, summarize the quotes in your own voice with appropriate citations. This is the time to begin including transition/connecting words and phrases between summarized quotes to bring your reader through your argument. Don’t forget to include “so what?” sentences and phrases after summarized quotes. In other words don’t only report what other authors said or found, tell the reader why that is important to your argument.

Assoc Prof in UW ECE

Why can animals outrun robots.

It is obvious that animals outperform robots at running – really, any legged locomotion task involving significant momentum. But what causes this performance gap? Could it be better actuators? sensors? “compute”-ers? The answer to this question is important for determining the most fruitful lines of research for roboticists interested in closing the performance gap. This observation motivated my co-authors and I to write a review paper that definitively answers the question .

Spoiler: it’s not the parts that gives animals the advantage – it must be something about how the parts assemble into the whole.

For historical accuracy, I should point out that the observation initially motivated two of the co-authors to take up the challenge: Tom Libby and Max Donelan . Max was on sabbatical in Berkeley in 2014, so he had time to think big thoughts. Tom was a PhD student and Director of the CiBER center at the time, so he had the motivation to go after weighty problems. These two intellectual heavyweights set themselves on the monumental task of systematically comparing biological and engineering technologies at the level of every individual component but also subsystem and whole-system levels across scales spanning ants and cockroaches to cheetahs and elephants. The original vision was to create a “datasheet” containing a comprehensive comparison of every known metric – plus definitions of new, better metrics and corresponding experiments to characterize them in biomechanical and electromechanical locomotors.

Aaaand .. it went about as well as could be expected.

Which is to say: it went sloooowly. And dauntingly. Overwhelmingly humblingly challengingly. Ego-crushing panic-inducing existentially dreadfully.

That may be overstating the sitch a lil bit. I’m definitely projecting more than a lil, as those were the feels I personally felt once I weaseled my way into the project years later. But you get the idea: it was a big project that required a tremendous amount from its workers.

But back to my weaseling. I was lucky enough to recruit Tom as a postdoc through a (now sadly defunct) Institute for Neuroengineering (called “UWIN” :) in 2017. The “AvM” project (“animals v. machines”) was still in the mix, but so were a half dozen other wonderfullly fascinating projects – both old and new – that were on his plate. In the intervening years, the AvM project scope had been dialed back to “merely” a mega-review, rather than a mega-review-plus-half-dozen-PhD-theses as originally conceived. But it was still too much ground for a pair of researchers to cover.

To put a finer point on it, by this time the scope had been dialed down to focus on 5 subsystems deemed critical for running: power , frame , sensing , actuation , and control . So all that was needed was expertise in5 different Departments: energy systems, material science, sensory neuroscience, kinesiology / biomechanics, and control theory. I genuinely believe Tom has such astonishing breadth that he could have covered all this ground himself. But doing so to the degree of rigor sought by the team would require review of hundreds of papers to convince onesself that you weren’t missing some critical detail that would invalidate the paper’s whole premise.

Observing Tom grapple with all this from the perspective of a postdoc ( co- )advisor, I made the very sage and selfless observation that what they were missing was … me! In particular, I felt I could offer two key benefits: I could handle the control subsystem, and I could lower their standards help enforce a reasonable project scope and timeline.

Given that this was in 2019 and you, dear reader, are being regaled with this delightful tale in or after the year 2024, I clearly delivered on no more than half of my promises.

I think my real contribution to the project occured two years of frustrated false starts later when I declared that what we were really missing was … more experts! I had actually made this suggestion many times before. In fact, I’d suggested it to Tom before I joined the project, which is in all likelihood the only reason I have the privilege of writing this today. But – to my recollection – Max resisted bringing even more people in for the longest time . (Probably because he regretted the mistake he and Tom already made with bringing in someone new …)

But after Max became the BPK Chair, he had to acknowledge that something needed to change if we were ever to release this monster into the world. So after a little deliberation we agreed that what was missing was … our friends! We had decided that assigning one expert to each subsystem would be most effective. Between the three of us, Max had power covered, Tom could handily handle actuation , and I could muddle through control . So we were missing frame and sensing . Fortunately for us, our numero uno choices for each subsystem readily agreed to join the project, so we now had Kaushik Jayaram on frame and Simon Sponberg on sensing . An interesting historical note is that we all had a strong connection to the biomechanics group at Berkeley, and in particular with Bob Full , a towering figure in the integrative study of movement: Bob was Max’s sabbatical host, the founder of the center Tom directed, the PhD advisor to Kaushik and Simon, and a cherished mentor and collaborator to me. This project is built on Bob’s shoulders.

With this fresh injection of energy and renewed purpose, we made rapid progress … until we didn’t. Although we’d significantly decreased the workload on each of us individually, the mammoth scope of the endeavor continued to conflict with our many other obligations. It was just too hard to squeeze in thinking such big thoughts and making such sweeping claims among teaching, advising, grantwriting, service, and life.

It’s at this point where the story gets a lot less interesting and therefore quickly wraps up. The project had lain dormant for many months when I received an email notice about a Special Issue on Legged Locomotion in Science Robotics with a deadline 6 weeks out. We’d been targeting SciRob since getting positive feedback on a pre-submission inquiry 5 years prior (lol). And putting these ideas into a Special Issue that the community would be more likely to see was an opportunity we couldn’t afford to miss. I happened to have the good fortune of being on sabbatical at that moment, so I had the time in addition to the motivation to close . So we made it happen.

It’s amazing what a time constraint can do :)

It’s also amazing what a space constraint can do: the original conception was a 10,000 word, 200 cite monolith, but Science Robotics advises a svelte 5,000 words and 75 cites. Not wanting to antagonize the editor or reviewers, we brought our S-tier pithiness to the problem. I regard brevity as my gift, so it was a delightful challenge to boil the ideas down to their bones and serve up only the delicious marrow from with- .. this analogy is getting a little thin and macabre, so let’s move on …

I want to talk a bit informally about the ideas in the paper and give context for some of the decisions and considerations that went into the final product. I’ll work through the sections in order.

When considering System Performance, the original conception was to commit to a specific set of metrics and quantify performance of a suite of robot and animal runners – to create a “datasheet” of sorts that the community could continue to build out over the years. However, there two major problems with this idea: one scientific, and one sociological.

The scientific challenge is that the metrics we have for concepts like range , agility , and robustness are inadequate to capture what seems intuitively clear. One grand idea we tossed around was the conjecture that any metric for these concepts could be computed from the reachable set , that is, the set of states that can be achieved by a control system through an admissible input signal in a given distribution of environments and a given parameterization of designs. We ultimately abandoned mentioning this idea because, although potentially interesting, there’s no currently practical way to compute this set (and Bellman tells us there can’t be in general).

The sociological challenge is that we did not want to dunk on our colleagues, or get into endless debates about why we chose the specific metric we did and why their robot did so poorly with respect to it. We figured that no reasonable person would challenge the assertion that animals outperform robots in their range, agility, and robustness (however you define these terms) – what would surely be controversial is how existing robots stack up relative to one another. So we opted for the qualitative / coarsely-quantized comparison in the first Figure.

Regarding the central conclusion, that the difference in performance of parts does not explain the difference in performance of wholes, there are some caveats.

If you were building a cyborg to run as far as possible completely power autonomous, using metabolism would give an order-of-magnitude advantage in range over gas power (nearly two orders-of-magnitude w.r.t. batteries). So along that solitary dimension, defined in that specific way, the difference in the part does explain the difference in the whole. But as soon as you allow that there may be gas stations or electrical outlets along the way, this advantage disappears.

The biological distribution of sensors throughout a body is quite compelling from an agility and robustness perspective: richly sensing terrain or other interactions with the environment could be a real boon for those dimensions of performance. But the “simulated cyborg” thought experiment from the Discussion convinces us that, even in the presence of perfect state information about the locomotor and environment, we still lack the tools to integrate that information to make a high-performing runner.

Finally, there are a couple of points to make about biological and engineered controllers. To make the most apples-to-apples comparison, we looked at natural and artificial spiking neural networks. Of course robot controllers can be implemented using conventional von Neumann architectures. But there are no proof-of-concept high-performing controllers in that paradigm to compare to those in animals, and the comparison is difficult to make at a component level: although we can pack upwards of hundreds of billions of transistors into a chip (comparable to the number of neurons in the human brain), it seems clear that a single transistor has less computational power than an individual neuron, and we are not aware of any rigorous attempt to quantify their relative computational power. Even the comparison between natural and artificial spiking neural networks is probably unfair in the sense that ANN dynamics are vastly simpler (e.g. piecewise-linear) than their biological counterparts (NNN?). But it’s the best comparison we can make at present, and including these factors would only tip the outcome even further in biology’s favor.

HOWever, even allowing that brains can, in principle, implement vastly more complex transformations than chips (at any scale – cockroaches have more neurons and synapses than the biggest neural ICs), it is important to remember that the brain is doing a whole lot more than locomotion. I keep returning to the example we cite in the paper (citation 90) of a parasitic wasp that lyses more than 7000 of its approximately 7400 neurons during pupation. The upshot is that there are autonomous flyers that can identify and infect hosts using fewer than 400 neurons !!! If you gave me 400 neurons, I think I’d struggle to invert a pendulum ..

My takeaway from this example is that we could be doing a lot more (robust and agile behavior) with a lot less (computational power) if only (a) we had the right bodies and (b) we knew what to do with them.

The Discussion covers a lot of ground that doesn’t need to be retrod here. But there is one point I want to dwell on a bit more, because I personally find it very interesting and compelling: the need for better metrics. This problem came up a few paragraphs ago when I discussed the challenge in defining what we mean by “agility” and “robustness”. One way to view the results of our paper is that we are focusing on the wrong metrics when we evaluate performance at the subsystem level, as these are evidently not predictive of system performance. What’s needed are metrics for the integration of multiple components or subsystems – and these metrics must capture something about the whole-system behavior we seek. The reason good metrics could be so powerful is that the endeavor of engineering is driven by “specs”, i.e. performance criteria. Once you tell me how my artifact is going to be evaluated, I can bring the powerful machinery of prototyping, optimization, learning, et al. to bear on squeezing that metric for everything it’s got. In the absence of metrics, engineering becomes art.

As a final note for the history books, I want to acknowledge where this paper fits in my intellectual and academic trajectory. I got my start in research in the summer before my first year of undergrad working with Eric Klavins , who began his career in robotics before switching to synbio. In fact, Eric got his PhD with a luminary in legged robotics, Dan Koditschek , and it was through this connection (certainly not merit) that I had the tremendous good fortune to do an REU at UPenn the summer after my sophomore year. The REU was my first exposure to the interdisciplinary world of legged locomotion, and I was completely enraptured. (Actually, for historical accuracy, I have to acknowledge that my very first exposure to this world was as a high school student when I was part of the inaugural cohort of students at the Summer Institute for Mathematics at the University of Washington , where the inimitable Tom Daniel gave an afternoon lecture on biolocomotion that included a very memorable demo on passive dynamic walking . So I suppose I was primed to become enraptured.)

Biolocomotion was the driver behind my applications to grad school and fellowships, and legged locomotion in particular ended up as the focus of my PhD thesis . My postdoc took me in a completely new direction – human-in-the-loop control – so when I started my faculty position there were two main areas of focus. Over time, legged locomotion has shrunk from the dominant theme at the beginning to now, where I have only one PhD student in this area, and they will graduate in six months. So this review represents the closure of a major chapter in my career – a very satisfying closure to be sure, but bittersweet nonetheless.

With that, I’ll stop – this commentary has already run almost half as many words as you’ll find in the paper :)

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About six-in-ten Americans say abortion should be legal in all or most cases

Note: For the latest data on views of abortion, read this July 2022 report .

Abortion has long been a contentious issue in the United States, and it is one that sharply divides Americans along partisan, ideological and religious lines.

Today, a 61% majority of U.S. adults say abortion should be legal in all or most cases, while 37% think abortion should be illegal in all or most cases. These views are relatively unchanged in the past few years. The latest Pew Research Center survey , conducted March 7 to 13, finds deep disagreement between – and within – the parties over abortion. In fact, the partisan divide on abortion is far wider than it was two decades ago.

Related: Explore an interactive look at Americans’ attitudes on abortion.

In the latest survey, Democrats and Democratic-leaning independents are 42 percentage points more likely than Republicans and Republican leaners to say abortion should be legal in all or most cases (80% vs. 38%). This gap is little changed over the last few years, but the current divide is wider than it was in the past. For instance, as recently as 2016, there was a 33-point gap between the shares of Democrats (72%) and Republicans (39%) who supported legal abortion in all or most cases.

Pew Research Center conducted this study to better understand Americans’ views on abortion. For this analysis, we surveyed 10,441 U.S. adults in March 2022. Everyone who took part in this survey is a member of the Center’s American Trends Panel (ATP), an online survey panel that is recruited through national, random sampling of residential addresses. This way nearly all U.S. adults have a chance of selection. The survey is weighted to be representative of the U.S. adult population by gender, race, ethnicity, partisan affiliation, education and other categories. Read more about the ATP’s methodology .

Here are the questions used for this report, along with responses, and its methodology .

This wider gap is mostly attributable to a steady increase in support for legal abortion among Democrats. In 2007, roughly two-thirds of Democrats and Democratic leaners (63%) said abortion should be legal in all or most cases. Support among Democrats has risen by nearly 20 points since then, and 80% now say abortion should be legal in all or most cases.

Views among Republicans have remained relatively steady during this period. In 2007, around four-in-ten Republicans (39%) said abortion should be legal in all or most cases; today, 38% say this.

There are ideological differences within both parties over abortion, though the divide is starker within the GOP. Among Republicans and Republican-leaning independents, 60% of moderates and liberals say abortion should be legal in all or most cases, compared with just 27% of conservative Republicans.

While liberal Democrats are 18 percentage points more likely than conservative and moderate Democrats to say abortion should be legal in all or most cases, wide majorities of both groups (90% and 72%, respectively) say this.

Support for legal abortion varies by race and ethnicity, education and religious affiliation.

Majorities of adults across racial and ethnic groups say abortion should be legal in all or most cases. White adults and Hispanic adults, however, are slightly less likely to say this than Black and Asian adults. Roughly six-in-ten White (59%) and Hispanic adults (60%) say abortion should be legal in all or most cases, compared with larger majorities of Black (68%) and Asian (74%) adults.

Support for legal abortion is greater among those with higher levels of education. While majorities of those with a postgraduate degree (69%), bachelor’s degree (64%) and those with some college experience (63%) say abortion should be legal in all or most cases, adults with no more than a high school education are more divided on the issue: 54% say abortion should be legal in at least most cases, while 44% say abortion should be illegal in all or most cases.

White evangelical Protestants continue to be opposed to abortion in all or most cases. Nearly three-quarters of White evangelicals (74%) say it should be illegal in all or most cases, while 24% say it should be legal in at least most cases. In contrast, a majority of White Protestants who are not evangelical (60%) say abortion should be legal in all or most cases.   Religious “nones” – those who are religiously unaffiliated – overwhelmingly support legal abortion. Over eight-in-ten (84%) say it should be legal in all or most cases, while just 15% say it should be illegal.

Among the public overall, there is a modest gender divide in views of whether abortion should be legal: 58% of men and 63% of women say it should be legal in at least most cases. Within both parties, the views of men and women are largely aligned. Among Democrats, 80% of both men and women say abortion should be legal in all or most cases. Similarly, 36% of Republican men and 39% of Republican women say the same.

Note: This is an update of a post originally published July 17, 2017. Here are the questions used for this report, along with responses, and its methodology .

Hannah Hartig is a senior researcher focusing on U.S. politics and policy research at Pew Research Center

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