sample research rationale

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How to Write the Rationale of the Study in Research (Examples)

What is the Rationale of the Study?

The rationale of the study is the justification for taking on a given study. It explains the reason the study was conducted or should be conducted. This means the study rationale should explain to the reader or examiner why the study is/was necessary. It is also sometimes called the “purpose” or “justification” of a study. While this is not difficult to grasp in itself, you might wonder how the rationale of the study is different from your research question or from the statement of the problem of your study, and how it fits into the rest of your thesis or research paper. 

The rationale of the study links the background of the study to your specific research question and justifies the need for the latter on the basis of the former. In brief, you first provide and discuss existing data on the topic, and then you tell the reader, based on the background evidence you just presented, where you identified gaps or issues and why you think it is important to address those. The problem statement, lastly, is the formulation of the specific research question you choose to investigate, following logically from your rationale, and the approach you are planning to use to do that.

Table of Contents:

How to write a rationale for a research paper , how do you justify the need for a research study.

• Study Rationale Example: Where Does It Go In Your Paper?

The basis for writing a research rationale is preliminary data or a clear description of an observation. If you are doing basic/theoretical research, then a literature review will help you identify gaps in current knowledge. In applied/practical research, you base your rationale on an existing issue with a certain process (e.g., vaccine proof registration) or practice (e.g., patient treatment) that is well documented and needs to be addressed. By presenting the reader with earlier evidence or observations, you can (and have to) convince them that you are not just repeating what other people have already done or said and that your ideas are not coming out of thin air. 

Once you have explained where you are coming from, you should justify the need for doing additional research–this is essentially the rationale of your study. Finally, when you have convinced the reader of the purpose of your work, you can end your introduction section with the statement of the problem of your research that contains clear aims and objectives and also briefly describes (and justifies) your methodological approach. 

When is the Rationale for Research Written?

The author can present the study rationale both before and after the research is conducted. 

• Before conducting research : The study rationale is a central component of the research proposal . It represents the plan of your work, constructed before the study is actually executed.
• Once research has been conducted : After the study is completed, the rationale is presented in a research article or  PhD dissertation  to explain why you focused on this specific research question. When writing the study rationale for this purpose, the author should link the rationale of the research to the aims and outcomes of the study.

What to Include in the Study Rationale

Although every study rationale is different and discusses different specific elements of a study’s method or approach, there are some elements that should be included to write a good rationale. Make sure to touch on the following:

• A summary of conclusions from your review of the relevant literature
• What is currently unknown (gaps in knowledge)
• Inconclusive or contested results  from previous studies on the same or similar topic
• The necessity to improve or build on previous research, such as to improve methodology or utilize newer techniques and/or technologies

There are different types of limitations that you can use to justify the need for your study. In applied/practical research, the justification for investigating something is always that an existing process/practice has a problem or is not satisfactory. Let’s say, for example, that people in a certain country/city/community commonly complain about hospital care on weekends (not enough staff, not enough attention, no decisions being made), but you looked into it and realized that nobody ever investigated whether these perceived problems are actually based on objective shortages/non-availabilities of care or whether the lower numbers of patients who are treated during weekends are commensurate with the provided services.

In this case, “lack of data” is your justification for digging deeper into the problem. Or, if it is obvious that there is a shortage of staff and provided services on weekends, you could decide to investigate which of the usual procedures are skipped during weekends as a result and what the negative consequences are. 

In basic/theoretical research, lack of knowledge is of course a common and accepted justification for additional research—but make sure that it is not your only motivation. “Nobody has ever done this” is only a convincing reason for a study if you explain to the reader why you think we should know more about this specific phenomenon. If there is earlier research but you think it has limitations, then those can usually be classified into “methodological”, “contextual”, and “conceptual” limitations. To identify such limitations, you can ask specific questions and let those questions guide you when you explain to the reader why your study was necessary:

Methodological limitations

• Did earlier studies try but failed to measure/identify a specific phenomenon?
• Was earlier research based on incorrect conceptualizations of variables?
• Were earlier studies based on questionable operationalizations of key concepts?
• Did earlier studies use questionable or inappropriate research designs?

Contextual limitations

• Have recent changes in the studied problem made previous studies irrelevant?
• Are you studying a new/particular context that previous findings do not apply to?

Conceptual limitations

• Do previous findings only make sense within a specific framework or ideology?

Study Rationale Examples

Let’s look at an example from one of our earlier articles on the statement of the problem to clarify how your rationale fits into your introduction section. This is a very short introduction for a practical research study on the challenges of online learning. Your introduction might be much longer (especially the context/background section), and this example does not contain any sources (which you will have to provide for all claims you make and all earlier studies you cite)—but please pay attention to how the background presentation , rationale, and problem statement blend into each other in a logical way so that the reader can follow and has no reason to question your motivation or the foundation of your research.

Background presentation

Since the beginning of the Covid pandemic, most educational institutions around the world have transitioned to a fully online study model, at least during peak times of infections and social distancing measures. This transition has not been easy and even two years into the pandemic, problems with online teaching and studying persist (reference needed) . 

While the increasing gap between those with access to technology and equipment and those without access has been determined to be one of the main challenges (reference needed) , others claim that online learning offers more opportunities for many students by breaking down barriers of location and distance (reference needed) .  

Rationale of the study

Since teachers and students cannot wait for circumstances to go back to normal, the measures that schools and universities have implemented during the last two years, their advantages and disadvantages, and the impact of those measures on students’ progress, satisfaction, and well-being need to be understood so that improvements can be made and demographics that have been left behind can receive the support they need as soon as possible.

Statement of the problem

To identify what changes in the learning environment were considered the most challenging and how those changes relate to a variety of student outcome measures, we conducted surveys and interviews among teachers and students at ten institutions of higher education in four different major cities, two in the US (New York and Chicago), one in South Korea (Seoul), and one in the UK (London). Responses were analyzed with a focus on different student demographics and how they might have been affected differently by the current situation.

How long is a study rationale?

In a research article bound for journal publication, your rationale should not be longer than a few sentences (no longer than one brief paragraph). A  dissertation or thesis  usually allows for a longer description; depending on the length and nature of your document, this could be up to a couple of paragraphs in length. A completely novel or unconventional approach might warrant a longer and more detailed justification than an approach that slightly deviates from well-established methods and approaches.

Consider Using Professional Academic Editing Services

Now that you know how to write the rationale of the study for a research proposal or paper, you should make use of our free AI grammar checker , Wordvice AI, or receive professional academic proofreading services from Wordvice, including research paper editing services and manuscript editing services to polish your submitted research documents.

You can also find many more articles, for example on writing the other parts of your research paper , on choosing a title , or on making sure you understand and adhere to the author instructions before you submit to a journal, on the Wordvice academic resources pages.

How to Write the Rationale for a Research Paper

• Research Process
• Peer Review

A research rationale answers the big SO WHAT? that every adviser, peer reviewer, and editor has in mind when they critique your work. A compelling research rationale increases the chances of your paper being published or your grant proposal being funded. In this article, we look at the purpose of a research rationale, its components and key characteristics, and how to create an effective research rationale.

Updated on September 19, 2022

The rationale for your research is the reason why you decided to conduct the study in the first place. The motivation for asking the question. The knowledge gap. This is often the most significant part of your publication. It justifies the study's purpose, novelty, and significance for science or society. It's a critical part of standard research articles as well as funding proposals.

Essentially, the research rationale answers the big SO WHAT? that every (good) adviser, peer reviewer, and editor has in mind when they critique your work.

A compelling research rationale increases the chances of your paper being published or your grant proposal being funded. In this article, we look at:

• the purpose of a research rationale
• its components and key characteristics
• how to create an effective research rationale

What is a research rationale?

Think of a research rationale as a set of reasons that explain why a study is necessary and important based on its background. It's also known as the justification of the study, rationale, or thesis statement.

Essentially, you want to convince your reader that you're not reciting what other people have already said and that your opinion hasn't appeared out of thin air. You've done the background reading and identified a knowledge gap that this rationale now explains.

A research rationale is usually written toward the end of the introduction. You'll see this section clearly in high-impact-factor international journals like Nature and Science. At the end of the introduction there's always a phrase that begins with something like, "here we show..." or "in this paper we show..." This text is part of a logical sequence of information, typically (but not necessarily) provided in this order:

Here's an example from a study by Cataldo et al. (2021) on the impact of social media on teenagers' lives.

Note how the research background, gap, rationale, and objectives logically blend into each other.

The authors chose to put the research aims before the rationale. This is not a problem though. They still achieve a logical sequence. This helps the reader follow their thinking and convinces them about their research's foundation.

Elements of a research rationale

We saw that the research rationale follows logically from the research background and literature review/observation and leads into your study's aims and objectives.

This might sound somewhat abstract. A helpful way to formulate a research rationale is to answer the question, “Why is this study necessary and important?”

Generally, that something has never been done before should not be your only motivation. Use it only If you can give the reader valid evidence why we should learn more about this specific phenomenon.

A well-written introduction covers three key elements:

• What's the background to the research?
• What has been done before (information relevant to this particular study, but NOT a literature review)?
• Research rationale

Now, let's see how you might answer the question.

1. This study complements scientific knowledge and understanding

Discuss the shortcomings of previous studies and explain how'll correct them. Your short review can identify:

• Methodological limitations . The methodology (research design, research approach or sampling) employed in previous works is somewhat flawed.

Example : Here , the authors claim that previous studies have failed to explore the role of apathy “as a predictor of functional decline in healthy older adults” (Burhan et al., 2021). At the same time, we know a lot about other age-related neuropsychiatric disorders, like depression.

Their study is necessary, then, “to increase our understanding of the cognitive, clinical, and neural correlates of apathy and deconstruct its underlying mechanisms.” (Burhan et al., 2021).

• Contextual limitations . External factors have changed and this has minimized or removed the relevance of previous research.

Example : You want to do an empirical study to evaluate the effects of the COVID-19 pandemic on the number of tourists visiting Sicily. Previous studies might have measured tourism determinants in Sicily, but they preceded COVID-19.

• Conceptual limitations . Previous studies are too bound to a specific ideology or a theoretical framework.

Example : The work of English novelist E. M. Forster has been extensively researched for its social, political, and aesthetic dimensions. After the 1990s, younger scholars wanted to read his novels as an example of gay fiction. They justified the need to do so based on previous studies' reliance on homophobic ideology.

This kind of rationale is most common in basic/theoretical research.

2. This study can help solve a specific problem

Here, you base your rationale on a process that has a problem or is not satisfactory.

For example, patients complain about low-quality hospital care on weekends (staff shortages, inadequate attention, etc.). No one has looked into this (there is a lack of data). So, you explore if the reported problems are true and what can be done to address them. This is a knowledge gap.

Or you set out to explore a specific practice. You might want to study the pros and cons of several entry strategies into the Japanese food market.

It's vital to explain the problem in detail and stress the practical benefits of its solution. In the first example, the practical implications are recommendations to improve healthcare provision.

In the second example, the impact of your research is to inform the decision-making of businesses wanting to enter the Japanese food market.

This kind of rationale is more common in applied/practical research.

3. You're the best person to conduct this study

It's a bonus if you can show that you're uniquely positioned to deliver this study, especially if you're writing a funding proposal .

For an anthropologist wanting to explore gender norms in Ethiopia, this could be that they speak Amharic (Ethiopia's official language) and have already lived in the country for a few years (ethnographic experience).

Or if you want to conduct an interdisciplinary research project, consider partnering up with collaborators whose expertise complements your own. Scientists from different fields might bring different skills and a fresh perspective or have access to the latest tech and equipment. Teaming up with reputable collaborators justifies the need for a study by increasing its credibility and likely impact.

When is the research rationale written?

You can write your research rationale before, or after, conducting the study.

In the first case, when you might have a new research idea, and you're applying for funding to implement it.

Or you're preparing a call for papers for a journal special issue or a conference. Here , for instance, the authors seek to collect studies on the impact of apathy on age-related neuropsychiatric disorders.

In the second case, you have completed the study and are writing a research paper for publication. Looking back, you explain why you did the study in question and how it worked out.

Although the research rationale is part of the introduction, it's best to write it at the end. Stand back from your study and look at it in the big picture. At this point, it's easier to convince your reader why your study was both necessary and important.

How long should a research rationale be?

The length of the research rationale is not fixed. Ideally, this will be determined by the guidelines (of your journal, sponsor etc.).

The prestigious journal Nature , for instance, calls for articles to be no more than 6 or 8 pages, depending on the content. The introduction should be around 200 words, and, as mentioned, two to three sentences serve as a brief account of the background and rationale of the study, and come at the end of the introduction.

If you're not provided guidelines, consider these factors:

• Research document : In a thesis or book-length study, the research rationale will be longer than in a journal article. For example, the background and rationale of this book exploring the collective memory of World War I cover more than ten pages.
• Research question : Research into a new sub-field may call for a longer or more detailed justification than a study that plugs a gap in literature.

Which verb tenses to use in the research rationale?

It's best to use the present tense. Though in a research proposal, the research rationale is likely written in the future tense, as you're describing the intended or expected outcomes of the research project (the gaps it will fill, the problems it will solve).

Example of a research rationale

Research question : What are the teachers' perceptions of how a sense of European identity is developed and what underlies such perceptions?

Braun, V., & Clarke, V. (2006). Using thematic analysis in psychology. Qualitative Research in Psychology , 3(2), 77-101.

Burhan, A.M., Yang, J., & Inagawa, T. (2021). Impact of apathy on aging and age-related neuropsychiatric disorders. Research Topic. Frontiers in Psychiatry

Cataldo, I., Lepri, B., Neoh, M. J. Y., & Esposito, G. (2021). Social media usage and development of psychiatric disorders in childhood and adolescence: A review. Frontiers in Psychiatry , 11.

CiCe Jean Monnet Network (2017). Guidelines for citizenship education in school: Identities and European citizenship children's identity and citizenship in Europe.

Cohen, l, Manion, L., & Morrison, K. (2018). Research methods in education . Eighth edition. London: Routledge.

de Prat, R. C. (2013). Euroscepticism, Europhobia and Eurocriticism: The radical parties of the right and left “vis-à-vis” the European Union P.I.E-Peter Lang S.A., Éditions Scientifiques Internationales.

European Commission. (2017). Eurydice Brief: Citizenship education at school in Europe.

Polyakova, A., & Fligstein, N. (2016). Is European integration causing Europe to become more nationalist? Evidence from the 2007–9 financial crisis. Journal of European Public Policy , 23(1), 60-83.

Winter, J. (2014). Sites of Memory, Sites of Mourning: The Great War in European Cultural History . Cambridge: Cambridge University Press.

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How do you Write the Rationale for Research?

• By DiscoverPhDs
• October 21, 2020

What is the Rationale of Research?

The term rationale of research means the reason for performing the research study in question. In writing your rational you should able to convey why there was a need for your study to be carried out. It’s an important part of your research paper that should explain how your research was novel and explain why it was significant; this helps the reader understand why your research question needed to be addressed in your research paper, term paper or other research report.

The rationale for research is also sometimes referred to as the justification for the study. When writing your rational, first begin by introducing and explaining what other researchers have published on within your research field.

Having explained the work of previous literature and prior research, include discussion about where the gaps in knowledge are in your field. Use these to define potential research questions that need answering and explain the importance of addressing these unanswered questions.

The rationale conveys to the reader of your publication exactly why your research topic was needed and why it was significant . Having defined your research rationale, you would then go on to define your hypothesis and your research objectives.

Final Comments

Defining the rationale research, is a key part of the research process and academic writing in any research project. You use this in your research paper to firstly explain the research problem within your dissertation topic. This gives you the research justification you need to define your research question and what the expected outcomes may be.

Need to write a list of abbreviations for a thesis or dissertation? Read our post to find out where they go, what to include and how to format them.

When you should and shouldn’t capitalise the names of chemical compounds and their abbreviations is not always clear.

In this post you’ll learn what the significance of the study means, why it’s important, where and how to write one in your paper or thesis with an example.

Join thousands of other students and stay up to date with the latest PhD programmes, funding opportunities and advice.

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Reference management software solutions offer a powerful way for you to track and manage your academic references. Read our blog post to learn more about what they are and how to use them.

Dr Patel gained his PhD in 2011 from Aston University, researching risk factors & systemic biomarkers for Type II diabetes & cardiovascular disease. He is currently a business director at a large global pharmaceutical.

Sabrina’s in the third year of her PhD at The University of Adelaide. Her esearch combines molecular techniques, data analysis, and next generation sequencing to investigate modifications on RNAs in plants.

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Setting Rationale in Research: Cracking the code for excelling at research

Knowledge and curiosity lays the foundation of scientific progress. The quest for knowledge has always been a timeless endeavor. Scholars seek reasons to explain the phenomena they observe, paving way for development of research. Every investigation should offer clarity and a well-defined rationale in research is a cornerstone upon which the entire study can be built.

Research rationale is the heartbeat of every academic pursuit as it guides the researchers to unlock the untouched areas of their field. Additionally, it illuminates the gaps in the existing knowledge, and identifies the potential contributions that the study aims to make.

Table of Contents

What Is Research Rationale and When Is It Written

Research rationale is the “why” behind every academic research. It not only frames the study but also outlines its objectives , questions, and expected outcomes. Additionally, it helps to identify the potential limitations of the study . It serves as a lighthouse for researchers that guides through data collection and analysis, ensuring their efforts remain focused and purposeful. Typically, a rationale is written at the beginning of the research proposal or research paper . It is an essential component of the introduction section and provides the foundation for the entire study. Furthermore, it provides a clear understanding of the purpose and significance of the research to the readers before delving into the specific details of the study. In some cases, the rationale is written before the methodology, data analysis, and other sections. Also, it serves as the justification for the research, and how it contributes to the field. Defining a research rationale can help a researcher in following ways:

1. Justification of a Research Problem

• Research rationale helps to understand the essence of a research problem.
• It designs the right approach to solve a problem. This aspect is particularly important for applied research, where the outcomes can have real-world relevance and impact.
• Also, it explains why the study is worth conducting and why resources should be allocated to pursue it.
• Additionally, it guides a researcher to highlight the benefits and implications of a strategy.

2. Elimination of Literature Gap

• Research rationale helps to ideate new topics which are less addressed.
• Additionally, it offers fresh perspectives on existing research and discusses the shortcomings in previous studies.
• It shows that your study aims to contribute to filling these gaps and advancing the field’s understanding.

3. Originality and Novelty

• The rationale highlights the unique aspects of your research and how it differs from previous studies.
• Furthermore, it explains why your research adds something new to the field and how it expands upon existing knowledge.
• It highlights how your findings might contribute to a better understanding of a particular issue or problem and potentially lead to positive changes.
• Besides these benefits, it provides a personal motivation to the researchers. In some cases, researchers might have personal experiences or interests that drive their desire to investigate a particular topic.

4. An Increase in Chances of Funding

• It is essential to convince funding agencies , supervisors, or reviewers, that a research is worth pursuing.
• Therefore, a good rationale can get your research approved for funding and increases your chances of getting published in journals; as it addresses the potential knowledge gap in existing research.

Overall, research rationale is essential for providing a clear and convincing argument for the value and importance of your research study, setting the stage for the rest of the research proposal or manuscript. Furthermore, it helps establish the context for your work and enables others to understand the purpose and potential impact of your research.

5 Key Elements of a Research Rationale

Research rationale must include certain components which make it more impactful. Here are the key elements of a research rationale:

By incorporating these elements, you provide a strong and convincing case for the legitimacy of your research, which is essential for gaining support and approval from academic institutions, funding agencies, or other stakeholders.

How to Write a Rationale in Research

Writing a rationale requires careful consideration of the reasons for conducting the study. It is usually written in the present tense.

Here are some steps to guide you through the process of writing a research rationale:

After writing the initial draft, it is essential to review and revise the research rationale to ensure that it effectively communicates the purpose of your research. The research rationale should be persuasive and compelling, convincing readers that your study is worthwhile and deserves their attention.

How Long Should a Research Rationale be?

Although there is no pre-defined length for a rationale in research, its length may vary depending on the specific requirements of the research project. It also depends on the academic institution or organization, and the guidelines set by the research advisor or funding agency. In general, a research rationale is usually a concise and focused document.

Typically, it ranges from a few paragraphs to a few pages, but it is usually recommended to keep it as crisp as possible while ensuring all the essential elements are adequately covered. The length of a research rationale can be roughly as follows:

1. For Research Proposal:

A. Around 1 to 3 pages

B. Ensure clear and comprehensive explanation of the research question, its significance, literature review , and methodological approach.

2. Thesis or Dissertation:

A. Around 3 to 5 pages

B. Ensure an extensive coverage of the literature review, theoretical framework, and research objectives to provide a robust justification for the study.

3. Journal Article:

A. Usually concise. Ranges from few paragraphs to one page

B. The research rationale is typically included as part of the introduction section

However, remember that the quality and content of the research rationale are more important than its length. The reasons for conducting the research should be well-structured, clear, and persuasive when presented. Always adhere to the specific institution or publication guidelines.

Example of a Research Rationale

In conclusion, the research rationale serves as the cornerstone of a well-designed and successful research project. It ensures that research efforts are focused, meaningful, and ethically sound. Additionally, it provides a comprehensive and logical justification for embarking on a specific investigation. Therefore, by identifying research gaps, defining clear objectives, emphasizing significance, explaining the chosen methodology, addressing ethical considerations, and recognizing potential limitations, researchers can lay the groundwork for impactful and valuable contributions to the scientific community.

So, are you ready to delve deeper into the world of research and hone your academic writing skills? Explore Enago Academy ‘s comprehensive resources and courses to elevate your research and make a lasting impact in your field. Also, share your thoughts and experiences in the form of an article or a thought piece on Enago Academy’s Open Platform .

Join us on a journey of scholarly excellence today!

Frequently Asked Questions

A rationale of the study can be written by including the following points: 1. Background of the Research/ Study 2. Identifying the Knowledge Gap 3. An Overview of the Goals and Objectives of the Study 4. Methodology and its Significance 5. Relevance of the Research

Start writing a research rationale by defining the research problem and discussing the literature gap associated with it.

A research rationale can be ended by discussing the expected results and summarizing the need of the study.

A rationale for thesis can be made by covering the following points: 1. Extensive coverage of the existing literature 2. Explaining the knowledge gap 3. Provide the framework and objectives of the study 4. Provide a robust justification for the study/ research 5. Highlight the potential of the research and the expected outcomes

A rationale for dissertation can be made by covering the following points: 1. Highlight the existing reference 2. Bridge the gap and establish the context of your research 3. Describe the problem and the objectives 4. Give an overview of the methodology

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The rationale for one’s research is the justification for undertaking a given study. It states the reason(s) why a researcher chooses to focus on the topic in question, including what the significance is and what gaps the research intends to fill. In short, it is an explanation that rationalises the need for the study. The rationale is typically followed by a hypothesis/ research question (s) and the study objectives.

When is the rationale for research written?

The rationale of a study can be presented both before and after the research is conducted. 

• Before : The rationale is a crucial part of your research proposal , representing the plan of your work as formulated before you execute your study.
• After : Once the study is completed, the rationale is presented in a research paper or dissertation to explain why you focused on the particular question. In this instance, you would link the rationale of your research project to the study aims and outcomes.

Basis for writing the research rationale

The study rationale is predominantly based on preliminary data . A literature review will help you identify gaps in the current knowledge base and also ensure that you avoid duplicating what has already been done. You can then formulate the justification for your study from the existing literature on the subject and the perceived outcomes of the proposed study.

Length of the research rationale

In a research proposal or research article, the rationale would not take up more than a few sentences . A thesis or dissertation would allow for a longer description, which could even run into a couple of paragraphs . The length might even depend on the field of study or nature of the experiment. For instance, a completely novel or unconventional approach might warrant a longer and more detailed justification.

Basic elements of the research rationale

Every research rationale should include some mention or discussion of the following: 

• An overview of your conclusions from your literature review
• Gaps in current knowledge
• Inconclusive or controversial findings from previous studies
• The need to build on previous research (e.g. unanswered questions, the need to update concepts in light of new findings and/or new technical advancements). 

Example of a research rationale

Note: This uses a fictional study.

Abc xyz is a newly identified microalgal species isolated from fish tanks. While Abc xyz algal blooms have been seen as a threat to pisciculture, some studies have hinted at their unusually high carotenoid content and unique carotenoid profile. Carotenoid profiling has been carried out only in a handful of microalgal species from this genus, and the search for microalgae rich in bioactive carotenoids has not yielded promising candidates so far. This in-depth examination of the carotenoid profile of Abc xyz will help identify and quantify novel and potentially useful carotenoids from an untapped aquaculture resource .

In conclusion

It is important to describe the rationale of your research in order to put the significance and novelty of your specific research project into perspective. Once you have successfully articulated the reason(s) for your research, you will have convinced readers of the importance of your work!

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How to Write a Rationale: A Guide for Research and Beyond

Ever found yourself scratching your head, wondering how to justify your choice of a research topic or project? You’re not alone! Writing a rationale, which essentially means explaining the ‘why’ behind your decisions, is crucial to any research process. It’s like the secret sauce that adds flavour to your research recipe. So, the only thing you need to know is how to write a rationale.

What is a Rationale?

A rationale in research is essentially the foundation of your study. It serves as the justification for undertaking a particular research project. At its core, the rationale explains why the research was conducted or needs to be conducted, thus addressing a specific knowledge gap or research question.

Here’s a breakdown of the key elements involved in crafting a rationale:

Linking Background to Research Question: 

The rationale should connect the background of the study to your specific research question. It involves presenting and discussing existing data on your topic, identifying gaps or issues in the current understanding, and explaining why addressing them is important​.

Objectives and Significance: 

Your rationale should clearly outline your research objectives – what you hope to discover or achieve through the study. It should also emphasize the subject’s significance in your field and explain why more or better research is needed​.

Methodological Approach: 

The rationale should briefly describe your proposed research method , whether qualitative (descriptive) or quantitative (experimental), and justify this choice​.

Justifying the Need for Research: 

The rationale isn’t just about what you’re doing and why it’s necessary. It can involve highlighting methodological, contextual, or conceptual limitations in previous studies and explaining how your research aims to overcome these limitations. Essentially, you’re making a case for why your research fills a crucial gap in existing knowledge​​.

Presenting Before and After Research: 

Interestingly, the rationale can be presented before and after the research. Before the research, it forms a central part of the research proposal, setting out the plan for the work. After the research, it’s presented in a research article or dissertation to explain the focus on a specific research question and link it to the study’s aims and outcomes​.

Elements to Include: 

A good rationale should include a summary of conclusions from your literature review, identify what is currently unknown, discuss inconclusive or contested results from previous studies, and emphasize the necessity to improve or build on previous research​.

Creating a rationale is a vital part of the research process, as it not only sets the stage for your study but also convinces readers of the value and necessity of your work.

How to Write a Rationale:

Writing a rationale for your research is crucial in conducting and presenting your study. It involves explaining why your research is necessary and important. Here’s a guide to help you craft a compelling rationale:

Identify the Problem or Knowledge Gap: 

Begin by clearly stating the issue or gap in knowledge that your research aims to address. Explain why this problem is important and merits investigation. It is the foundation of your rationale and sets the stage for the need for your research.​

Review the Literature: 

Conduct a thorough review of existing literature on your topic. It helps you understand what research has already been done and what gaps or open questions exist. Your rationale should build on this background by highlighting these gaps and emphasizing the importance of addressing them​​​​.

Define Your Research Questions/Hypotheses: 

Based on your understanding of the problem and literature review, clearly state the research questions or hypotheses that your study aims to explore. These should logically stem from the identified gaps or issues.

Explain Your Research Approach: 

Describe the methods you will use for your research, including data collection and analysis techniques. Justify why these methods are appropriate for addressing your research questions or hypotheses​​.

Discuss the Potential Impact of Your Research:  Explain the significance of your study. Consider both theoretical contributions and practical implications. For instance, how does your research advance existing knowledge? Does it have real-world applications? Is it relevant to a specific field or community?​

Consider Ethical Considerations: 

If your research involves human or animal subjects, discuss the ethical aspects and how you plan to conduct your study responsibly​.

Contextualise Your Study: 

Justify the relevance of your research by explaining how it fits into the broader context. Connect your study to current trends, societal needs, or academic discussions​​.

Support with Evidence: 

Provide evidence or examples that underscore the need for your research. It could include citing relevant studies, statistics, or scenarios that illustrate the problem or gap your research addresses​.

Methodological, Contextual, and Conceptual Limitations: 

Address any limitations of previous research and how your study aims to overcome them. It can include methodological flaws in previous studies, changes in external factors that make past research less relevant, or the need to study a phenomenon within a new conceptual framework​.

Placement in Your Paper: 

Typically, the rationale is written toward the end of the introduction section of your paper, providing a logical lead-in to your research questions and methodology​​.

By following these steps and considering your audience’s perspective, you can write a strong and compelling rationale that clearly communicates the significance and necessity of your research project.

Frequently Asked Questions:

What makes a good research rationale.

A good rationale clearly identifies a gap in existing knowledge, builds on previous research, and outlines why your study is necessary and significant.

How detailed should my literature review be in the rationale?

Your literature review should be comprehensive enough to highlight the gaps your research aims to fill, but it should not overshadow the rationale itself.

Conclusion: 

A well-crafted rationale is your ticket to making your research stand out. It’s about bridging gaps, challenging norms, and paving the way for new discoveries. So go ahead, make your rationale the cornerstone of your research narrative!

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• Researching

How to write a research rationale

When you are doing a research assessment piece in History, you’ll often be asked to write a rationale. This is particularly true for the source investigation assessment piece.

What is a ‘rationale’?

A rationale is a written explanation about your research task that helps your teacher understand the decisions you made before beginning your source research .

A research rationale is a statement that explains the reasons behind conducting a particular research study.

It outlines the background, context, and significance of the research and why it is important to answer the main inquiry question.

A rationale seeks to answer three questions:

• Why have you chosen this particular topic to research?
• What questions do you specifically want answered as a result of your research?
• How do you plan on finding the best sources during your research?

How to write a rationale

Based upon the three questions mentioned above, your rationale should have three distinct sections that answer each one.

Please note that you can answer all three in a single paragraph, but the examples below will show them as three separate paragraphs.

Part 1: Explain your topic choice

You should explain as clearly as possible why this particular subject interested you.

Don’t just say “it is interesting”: give specific reasons why.

The more precise you are, the better your mark will be. 

Useful sentence starters for explaining topic choice:

• I was curious to discover…
• I wanted to know…
• I was confused by…
• I always wanted to know…
• I have always been fascinated by…
• I am particularly interested in…
• I was surprised to learn that … and I wanted to know more

Example explanation of topic choice:

Imperial Japan’s decision to surrender at the end of World War II seemed like a historical anomaly based upon what we learned in class about the Japanese ideologies behind bushido and the samurai. I wanted to know to what degree the atomic bombs had an influence upon the ultimate decision to surrender. I specifically want to know what the Japanese primary sources said at the time of the events to see their perspective. In particular, want to know if Emperor Hirohito left any documents that explained his decisions.  

Part 2: Explain your research questions

You need to explain the steps that helped you to create your Key Inquiry Question and Sub-Questions .

Remember that these questions should constantly be refined to include specific historical terms and information that you found during your background research .

Explain to your teacher why you have included specific information in your research questions.

Useful sentence starters for explaining research questions:

• The three specific aspects that I wanted to focus upon are…
• I knew that I had to develop my understanding of…
• My background research focused upon…

Example explanation of research questions:

Since I wanted to focus my research on the Japanese primary sources, my Key Inquiry Question is primarily about the role that the atomic bombs had upon the emperor’s decision to surrender at the end of World War II. I guess that there may not be a lot of primary sources written by the emperor himself, so I have formed three separate questions to look at his decisions from different angles. My first question focuses on what Japanese primary sources said at the time, including the emperor. My second question looks at how contemporary Japanese historians interpret this event. Finally, my third question seeks to understand how western historians understand Hirohito’s motivations.

Part 3: Explain how you will find your sources

You need to explain what strategies you have to help you find great sources to answer your research questions.

In this section, you want to specifically name the databases, museums or other research resources you know you will utilise to find the best sources on your topic.

It may also be useful to specifically name important historians or primary sources that you know in advance that you’ll need to read closely to help answer your questions.

Useful sentence starters for explaining source research:

• I have chosen to use…
• One of the best sources I found was…
• The most important sources I have use are…
• To ensure I had a range of perspectives I…
• It was important to include as one of my sources…

Example explanation of source research: 

I knew that finding Japanese primary sources was going to be hard, as I fear that many of them have not been translated into English. As a result, I am going to start my research by looking at what western historians say by gathering some academic articles from the JSTOR database. I hope that these historians will reference some translated Japanese primary sources and that will lead me to some great resources. After that, I know that the Tokyo Museum website has some primary source documents that may be of use to me, so look through their resources. Finally, during my background research, I stumbled across the prominent Japanese historian, Suzuki, who focuses a lot on this period, so I want to find out what his opinion is of these events. I believe that these resources should give me ample information to help answer my research questions.

Word limit advice

Answering all of these sections in a limited word count can be a challenge.

Therefore, don’t waste space on things that don’t matter, such as simply describing a historical event or person, or talking about simplistic decision-making choices (such as “I just really like wars”).

The rationale’s purpose is to explain your decision-making process. Therefore, if what you’re saying is not relevant, don’t waste space talking about it.

Example rationale

After learning about Ned Kelly in class, I was fascinated to discover that historians disagree about his motivations. What I wanted to learn about is the role that racist attitudes towards the Irish in colonial Australia had upon his life. I don’t know much about the social division between the English and Irish in Australian history, so I want to see how people who lived during these events described Ned Kelly, in order to see if racism was an important factor.

As a result, I have written my Key Inquiry Question to focus on the representation of Ned Kelly in the popular media. To help answer this, I have written my sub-questions to focus on different media types: my first question asks about how the newspapers reported on Kelly; my second is about how he is mentioned in religious sermons of the day; and my third question focuses on his representation in public posters, such as the ‘wanted’ signs for his arrest.

Since my questions are focused heavily on the primary sources, I know that I will have to start my source research on the Trove newspaper database website. This will allow me to quickly find newspaper reports about the main events in Kelly’s life. Secondly, I know that I will have trouble finding church sermons and public posters, so I will have to look for museum websites that may have these resources already, such as the Museum of Victoria and the State Library of New South Wales. I know that they often have educational resources for teachers that include primary sources. Finally, I know from my background research that Manning Clark has done a lot of research on Kelly’s life, so I hope he will mention important primary sources that can help me out, including the Jerilderie Letter.

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Rationale for the Study

It is important for you to be able to explain the importance of the research you are conducting by providing valid arguments. Rationale for the study, also referred to as justification for the study, is reason why you have conducted your study in the first place. This part in your paper needs to explain uniqueness and importance of your research. Rationale for the study needs to be specific and ideally, it should relate to the following points:

1. The research needs to contribute to the elimination of a gap in the literature. Elimination of gap in the present literature is one of the compulsory requirements for your study. In other words, you don’t need to ‘re-invent the wheel’ and your research aims and objectives need to focus on new topics. For example, you can choose to conduct an empirical study to assess the implications of COVID-19 pandemic on the numbers of tourists visitors in your city. This might be previously undressed topic, taking into account that COVID-19 pandemic is a relatively recent phenomenon.

Alternatively, if you cannot find a new topic to research, you can attempt to offer fresh perspectives on existing management, business or economic issues. For example, while thousands of studies have been previously conducted to study various aspects of leadership, this topic as far from being exhausted as a research area. Specifically, new studies can be conducted in the area of leadership to analyze the impacts of new communication mediums such as TikTok, and other social networking sites on leadership practices.

You can also discuss the shortcomings of previous works devoted to your research area. Shortcomings in previous studies can be divided into three groups:

a) Methodological limitations . Methodology employed in previous study may be flawed in terms of research design, research approach or sampling.

b) Contextual limitations . Relevance of previous works may be non-existent for the present because external factors have changed.

c) Conceptual limitations . Previous studies may be unjustifiably bound up to a particular model or an ideology.

While discussing the shortcomings of previous studies you should explain how you are going to correct them. This principle is true to almost all areas in business studies i.e. gaps or shortcomings in the literature can be found in relation to almost all areas of business and economics.

2. The research can be conducted to solve a specific problem. It helps if you can explain why you are the right person and in the right position to solve the problem. You have to explain the essence of the problem in a detailed manner and highlight practical benefits associated with the solution of the problem. Suppose, your dissertation topic is “a study into advantages and disadvantages of various entry strategies into Chinese market”. In this case, you can say that practical implications of your research relates to assisting businesses aiming to enter Chinese market to do more informed decision making.

Alternatively, if your research is devoted to the analysis of impacts of CSR programs and initiatives on brand image, practical contributions of your study would relate to contributing to the level of effectiveness of CSR programs of businesses.

Additional examples of studies that can assist to address specific practical problems may include the following:

• A study into the reasons of high employee turnover at Hanson Brick
• A critical analysis of employee motivation problems at Esporta, Finchley Road, London
• A research into effective succession planning at Microsoft
• A study into major differences between private and public primary education in the USA and implications of these differences on the quality of education

However, it is important to note that it is not an obligatory for a dissertation   to be associated with the solution of a specific problem. Dissertations can be purely theory-based as well. Examples of such studies include the following:

• Born or bred: revising The Great Man theory of leadership in the 21 st century
• A critical analysis of the relevance of McClelland’s Achievement theory to the US information technology industry
• Neoliberalism as a major reason behind the emergence of the global financial and economic crisis of 2007-2009
• Analysis of Lewin’s Model of Change and its relevance to pharmaceutical sector of France

3. Your study has to contribute to the level of professional development of the researcher . That is you. You have to explain in a detailed manner in what ways your research contributes to the achievement of your long-term career aspirations.

For example, you have selected a research topic of “ A critical analysis of the relevance of McClelland’s Achievement theory in the US information technology industry ”.  You may state that you associate your career aspirations with becoming an IT executive in the US, and accordingly, in-depth knowledge of employee motivation in this industry is going to contribute your chances of success in your chosen career path.

Therefore, you are in a better position if you have already identified your career objectives, so that during the research process you can get detailed knowledge about various aspects of your chosen industry.

My e-book, The Ultimate Guide to Writing a Dissertation in Business Studies: a step by step assistance offers practical assistance to complete a dissertation with minimum or no stress. The e-book covers all stages of writing a dissertation starting from the selection to the research area to submitting the completed version of the work within the deadline.

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How to write the rationale for research?

How to evaluate bias in meta-analysis within meta-epidemiological studies?

How to handle discrepancies while you collect data for systemic review

The research’s rationale describes why the study was undertaken (in a thesis or article) or why the study should be accompanied (in a proposal). This implies that the research justification should explain why the study is/was necessary to the reader or examiner. It is sometimes known as a study’s “purpose” or “justification.” While this is not difficult to understand in and of itself, you may be questioning how the study’s reasoning differs from your research question or the explanation of the problem of your study and how it turns into the remainder of your thesis or research paper.

Introduction

The rationale of your research is the objective of the study. The reason should explain why the research was started in the first place. It’s an essential part of your work since it demonstrates the significance and uniqueness of your research. As a result, it’s often referred to as the study’s reason. Your analysis would be arranged in an ideal world: observation, justification, hypothesis, objectives, methodology, findings, and conclusions. To begin writing your rationale, offer background information on all the research on your study topic. Then consider, “What is missing?” or “What are the research’s unanswered questions?” Identify the gaps in the literature and explain why they must be filled. Finally, it resolves to serve as the foundation for your investigation.

A study’s reason might be provided before and after the investigation.

• Before : The reason is essential to your research proposal since it represents the work plan you developed before carrying out your investigation.
• After : When the investigation is over, the justification is given in a literature research paper or thesis to explain why you choose to focus on the specific subject. In this case, you would connect your research project’s logic to the study’s goals and outcomes.

The rationale for the study

Consider a research rationale, a set of arguments explaining why a study is required and significant in light of its context. It is also the study’s reason, rationale, or thesis statement. Essentially, you want to persuade your reader that you are not repeating what others have already stated and that your perspective did not emerge from thin air. You’ve researched and found a knowledge gap that this justification now fills.

Basic elements of the research rationale

Typically, a clinical research justification is provided near the conclusion of the introduction. This area is prominent in high-impact-factor international publications such as Nature and Science. There is usually a line after the introduction that begins with “here we show” or “in this paper, we demonstrate.” This paragraph is part of a logical sequence of information, which is often (but not always) presented in the following order:

• Research background : What brings you here? Present (and cite) previous research and data on the subject.
• A gap in the literature : Which gaps haven’t been addressed based on the background evidence presented? Or, what is the problem that needs to be solved/process that needs to be improved?
• Research rationale : Why is it critical to fill these gaps or to solve/improve this problem/process?
• Research objectives and methodology : What will you investigate (your research question/goal)? How are you going to approach it (methods)?

Hope to accomplish

Describe the issue that your research will address: The problem your study will address, also known as your research subject, informs the reader about the scope of your investigation. Your research topic should be as detailed as possible, especially in a professional environment. In addition, specific research topics are more likely to lead to financing opportunities for your project.

Discourse the methodology for your study:  Explain to your audience how you intend to conduct your clinical research and offer a broad timeline for each stage. Include details about how you plan to contact research participants if your study spans several months or years.

Predict the results of your study:  A hypothesis isn’t always necessary, but it might assist in supporting your case. If you can make a more than speculative forecast, include it in your rationale. To represent your research topic, make your hypothesis as detailed as possible.

Clarify what you hope your study will accomplish:  Your clinical research should uncover something fresh that has not before been explored in your sector. Finding something that no one else has discovered isn’t enough. You must also explain that your findings will significantly advance your field or that they will clear up a past misunderstanding.

In a journal-accepted research manuscript, your justification should be no more than a few words long (no longer than one brief paragraph). A longer description is generally allowed in a manuscript or thesis; depending on the length and type of your material, this might be up to several paragraphs lengthy. A wholly new or unique technique may require a more prolonged and extensive justification than one that deviates somewhat from well-established procedures and approaches.

It is critical to discuss the reason for your study to understand the relevance and uniqueness of your research effort. You will have persuaded readers of the significance of your work once you have adequately expressed the reason(s) for your study. Defining the justification research is a critical component of the research process and academic writing in any reasoning research endeavour . This is what you use in your research paper for the first time to explain the research problem inside your dissertation subject. This will give you the research reason you require to define your research topic and potential outcomes.

About Pubrica

Pubrica’s research team generates scientific and medical research articles that practitioners and authors may use as a resource. Pubrica medical writers help you create and modify the introduction by advising the reader of any defects or holes in the chosen research subject. Our experts are familiar with the structure that begins with a broad topic and then continues to a problem and background before going on to a targeted issue to provide the hypothesis.

• Huggett, Kathryn N., and William B. Jeffries. “Overview of active learning research and rationale for active learning.”  How-to Guide for Active Learning . Springer, Cham, 2021. 1-7.
• Bandrowski, Anita, et al. “Sparc data structure: Rationale and design of a fair standard for biomedical research data.”  bioRxiv  (2021).
• Andriotis, Konstantinos. “RATIONALE FOR LAUNCHING A NEW JOURNAL.”  Journal of Qualitative Research  1.1 (2020): 1-6.
• Russell, David R. “Retreading, Non-ing, and a TPC Rationale for Sub-disciplining in Writing Studies.”  College English  82.5 (2020): 472-483.

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• Writing effectively

Writing a rationale

How to write a rationale.

What is a rationale?

A rationale is when you are asked to give the reasoning or justification for an action or a choice you make.

There is a focus on the ‘ why ’ in a rationale: why you chose to do something, study or focus on something. It is a set of statements of purpose and significance and often addresses a gap or a need.

A rationale in Australian academic writing is rarely a whole task by itself.  It is often a part of a bigger task. For example, a part of a lesson plan might be to provide a rationale for why you chose to teach particular content or use a certain resource or activity, or you may be asked to provide a rationale as to why you chose a particular theory to apply or a concept to support.

You may be called upon to provide a rationale:

prior to an action or decision; why you plan to do something and how, or

• after you have acted or decided something; reflecting, looking back, why you did something and how it worked or not.

You can use language to signal you are clearly providing a rationale in your writing. You can link your rationale to learning outcomes or aims for a lesson, activity or assessment task.

A model: problem-solution-rationale

A rationale can be provided by offering longer essay-based support for why it is important to do something in a certain way – in that sense, a whole paper can be a rationale.

However, a more specific or focused way of thinking about a rationale is how we can overtly show we are justifying our choices with the language we use.

One way of doing this is to consider the problem or issue requiring attention, the solution and then the rationale or justification for the solution (the ‘why’). This sets the rationale (the reason) within a context.

A diagnostic assessment determined that the students required more attention to addition and subtraction of mixed fractions. This activity intends to address this problem by having the children engage with the task with blocks before it is done with figures. The reason I chose to do this is because students have higher comprehension levels when presented with visual or tangible representations of abstract problems (Benson, 2016). I also did this as I wanted to allow the children to ‘play’ with maths, to see that it can be a fun activity and in doing so, to breakdown some of the ‘anti-mathematics prejudices’ that Gaines (2017, p. 4) talks about.

The important thing here is the language used to signal the rationale , in this case:

The reason I chose to do this is because … and I also did this as …

Another problem / solution / rationale example:

Scaffolding is the support provided by the teacher or a significant other, such as a classmate, which helps students in learning (Gibbons, 2015). Some students were having difficulty with the language at entry while others, particularly those who had completed the pre-tasks, had few problems. Therefore, in order to address this disparity in level and understanding, mixed-ability pairs were created where the more competent student helped the other. On reflection, this was an effective way to run the activity for two reasons : it allowed peer-to-peer teaching which solidified both students’ understanding; and it scaffolded the support in a way that allowed me to roam the room lending advice to pairs as needed.

The language used to signal our rationale in this example:

in order to and for two reasons …

Language to signal rationale

in order to

the reason this was done/chosen …

for the following reason(s) …

for two/three reasons …

Language for further justification - showing importance

This was important / significant because …

This meant that I could…

This enabled me to …

… which enabled / allowed me to…

… which pointed to / highlighted that / showed me that …

The key thing to remember about rationale writing is to stand back from the writing, look at it in a big picture sense and ask yourself, ‘ Have I explained why? ’ If that is clearly articulated, you have provided a rationale.

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How to Write a Study Rationale

Last Updated: May 19, 2023 Fact Checked

This article was co-authored by Jake Adams and by wikiHow staff writer, Jennifer Mueller, JD . Jake Adams is an academic tutor and the owner of Simplifi EDU, a Santa Monica, California based online tutoring business offering learning resources and online tutors for academic subjects K-College, SAT & ACT prep, and college admissions applications. With over 14 years of professional tutoring experience, Jake is dedicated to providing his clients the very best online tutoring experience and access to a network of excellent undergraduate and graduate-level tutors from top colleges all over the nation. Jake holds a BS in International Business and Marketing from Pepperdine University. This article has been fact-checked, ensuring the accuracy of any cited facts and confirming the authority of its sources. This article has been viewed 53,245 times.

A study rationale explains the reason for a study and the importance of its findings for a particular field. Commonly, you'll need to write a study rationale as part of a university course of study, although you may also need to write one as a professional researcher to apply for funding or other support. As a student, your study rationale also justifies how it fulfills the requirements for your degree program or course of study. Do research before you write your study rationale so that you can discuss the previous work your study builds on and explain its significance to your field. Thorough research is also important in the professional context because your rationale will likely become part of the contract if funding or support is approved. [1] X Research source

Describing What You Hope to Accomplish

• For example, suppose you want to study how working the night shift affects the academic performance of college students who are taking classes during the day. A narrow question would measure a specific impact based on a specific amount of hours worked.

• Justify the methodology you're using. If there's another methodology that might accomplish the same result, describe it and explain why your methodology is superior — perhaps because it's more efficient, takes less time, or uses fewer resources. For example, you might get more information out of personal interviews, but creating an online questionnaire is more cost-effective.
• Particularly if you're seeking funding or support, this section of your rationale will also include details about the cost of your study and the facilities or resources you'll need. [3] X Research source

Tip: A methodology that is more complex, difficult, or expensive requires more justification than one that is straightforward and simple.

• For example, if you're studying the effect of working the night shift on academic performance, you might hypothesize that working 4 or more nights a week lowers students' grade point averages by more than 1 point.

• Use action words, such as "quantify" or "establish," when writing your goals. For example, you might write that one goal of your study is to "quantify the degree to which working at night inhibits the academic performance of college students."
• If you are a professional researcher, your objectives may need to be more specific and concrete. The organization you submit your rationale to will have details about the requirements to apply for funding and other support. [5] X Research source

Explaining Your Study's Significance

• Going into extensive detail usually isn't necessary. Instead, highlight the findings of the most significant work in the field that addressed a similar question.
• Provide references so that your readers can examine the previous studies for themselves and compare them to your proposed study.

• Methodological limitations: Previous studies failed to measure the variables appropriately or used a research design that had problems or biases
• Contextual limitations: Previous studies aren't relevant because circumstances have changed regarding the variables measured
• Conceptual limitations: Previous studies are too tied up in a specific ideology or framework

• For example, if a previous study had been conducted to support a university's policy that full-time students were not permitted to work, you might argue that it was too tied up in that specific ideology and that this biased the results. You could then point out that your study is not intended to advance any particular policy.

Tip: If you have to defend or present your rationale to an advisor or team, try to anticipate the questions they might ask you and include the answers to as many of those questions as possible.

Including Academic Proposal Information

• As a student, you might emphasize your major and specific classes you've taken that give you particular knowledge about the subject of your study. If you've served as a research assistant on a study with a similar methodology or covering a similar research question, you might mention that as well.
• If you're a professional researcher, focus on the experience you have in a particular field as well as the studies you've done in the past. If you have done studies with a similar methodology that were important in your field, you might mention those as well.

Tip: If you don't have any particular credentials or experience that are relevant to your study, tell the readers of your rationale what drew you to this particular topic and how you became interested in it.

• For example, if you are planning to conduct the study as fulfillment of the research requirement for your degree program, you might discuss any specific guidelines for that research requirement and list how your study meets those criteria.

• In most programs, there will be specific wording for you to include in your rationale if you're submitting it for a certain number of credits. Your instructor or advisor can help make sure you've worded this appropriately.

Study Rationale Outline and Example

Expert Q&A

• This article presents an overview of how to write a study rationale. Check with your instructor or advisor for any specific requirements that apply to your particular project. Thanks Helpful 0 Not Helpful 0

You Might Also Like

• ↑ https://research.com/research/how-to-write-research-methodology
• ↑ https://ris.leeds.ac.uk/applying-for-funding/developing-your-proposal/resources-and-tips/key-questions-for-researchers/
• ↑ https://www.cwauthors.com/article/how-to-write-the-rationale-for-your-research
• ↑ http://www.writingcentre.uct.ac.za/sites/default/files/image_tool/images/167/Rationale.pdf
• ↑ https://www.niaid.nih.gov/grants-contracts/write-research-plan
• ↑ https://www.esc.edu/degree-planning-academic-review/degree-program/student-degree-planning-guide/rationale-essay-writing/writing-tips/

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• Sampling Methods | Types, Techniques & Examples

Sampling Methods | Types, Techniques & Examples

Published on September 19, 2019 by Shona McCombes . Revised on June 22, 2023.

When you conduct research about a group of people, it’s rarely possible to collect data from every person in that group. Instead, you select a sample . The sample is the group of individuals who will actually participate in the research.

To draw valid conclusions from your results, you have to carefully decide how you will select a sample that is representative of the group as a whole. This is called a sampling method . There are two primary types of sampling methods that you can use in your research:

• Probability sampling involves random selection, allowing you to make strong statistical inferences about the whole group.
• Non-probability sampling involves non-random selection based on convenience or other criteria, allowing you to easily collect data.

You should clearly explain how you selected your sample in the methodology section of your paper or thesis, as well as how you approached minimizing research bias in your work.

Table of contents

Population vs. sample, probability sampling methods, non-probability sampling methods, other interesting articles, frequently asked questions about sampling.

First, you need to understand the difference between a population and a sample , and identify the target population of your research.

• The population is the entire group that you want to draw conclusions about.
• The sample is the specific group of individuals that you will collect data from.

The population can be defined in terms of geographical location, age, income, or many other characteristics.

It is important to carefully define your target population according to the purpose and practicalities of your project.

If the population is very large, demographically mixed, and geographically dispersed, it might be difficult to gain access to a representative sample. A lack of a representative sample affects the validity of your results, and can lead to several research biases , particularly sampling bias .

Sampling frame

The sampling frame is the actual list of individuals that the sample will be drawn from. Ideally, it should include the entire target population (and nobody who is not part of that population).

Sample size

The number of individuals you should include in your sample depends on various factors, including the size and variability of the population and your research design. There are different sample size calculators and formulas depending on what you want to achieve with statistical analysis .

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Probability sampling means that every member of the population has a chance of being selected. It is mainly used in quantitative research . If you want to produce results that are representative of the whole population, probability sampling techniques are the most valid choice.

There are four main types of probability sample.

1. Simple random sampling

In a simple random sample, every member of the population has an equal chance of being selected. Your sampling frame should include the whole population.

To conduct this type of sampling, you can use tools like random number generators or other techniques that are based entirely on chance.

2. Systematic sampling

Systematic sampling is similar to simple random sampling, but it is usually slightly easier to conduct. Every member of the population is listed with a number, but instead of randomly generating numbers, individuals are chosen at regular intervals.

If you use this technique, it is important to make sure that there is no hidden pattern in the list that might skew the sample. For example, if the HR database groups employees by team, and team members are listed in order of seniority, there is a risk that your interval might skip over people in junior roles, resulting in a sample that is skewed towards senior employees.

3. Stratified sampling

Stratified sampling involves dividing the population into subpopulations that may differ in important ways. It allows you draw more precise conclusions by ensuring that every subgroup is properly represented in the sample.

To use this sampling method, you divide the population into subgroups (called strata) based on the relevant characteristic (e.g., gender identity, age range, income bracket, job role).

Based on the overall proportions of the population, you calculate how many people should be sampled from each subgroup. Then you use random or systematic sampling to select a sample from each subgroup.

4. Cluster sampling

Cluster sampling also involves dividing the population into subgroups, but each subgroup should have similar characteristics to the whole sample. Instead of sampling individuals from each subgroup, you randomly select entire subgroups.

If it is practically possible, you might include every individual from each sampled cluster. If the clusters themselves are large, you can also sample individuals from within each cluster using one of the techniques above. This is called multistage sampling .

This method is good for dealing with large and dispersed populations, but there is more risk of error in the sample, as there could be substantial differences between clusters. It’s difficult to guarantee that the sampled clusters are really representative of the whole population.

In a non-probability sample, individuals are selected based on non-random criteria, and not every individual has a chance of being included.

This type of sample is easier and cheaper to access, but it has a higher risk of sampling bias . That means the inferences you can make about the population are weaker than with probability samples, and your conclusions may be more limited. If you use a non-probability sample, you should still aim to make it as representative of the population as possible.

Non-probability sampling techniques are often used in exploratory and qualitative research . In these types of research, the aim is not to test a hypothesis about a broad population, but to develop an initial understanding of a small or under-researched population.

1. Convenience sampling

A convenience sample simply includes the individuals who happen to be most accessible to the researcher.

This is an easy and inexpensive way to gather initial data, but there is no way to tell if the sample is representative of the population, so it can’t produce generalizable results. Convenience samples are at risk for both sampling bias and selection bias .

2. Voluntary response sampling

Similar to a convenience sample, a voluntary response sample is mainly based on ease of access. Instead of the researcher choosing participants and directly contacting them, people volunteer themselves (e.g. by responding to a public online survey).

Voluntary response samples are always at least somewhat biased , as some people will inherently be more likely to volunteer than others, leading to self-selection bias .

3. Purposive sampling

This type of sampling, also known as judgement sampling, involves the researcher using their expertise to select a sample that is most useful to the purposes of the research.

It is often used in qualitative research , where the researcher wants to gain detailed knowledge about a specific phenomenon rather than make statistical inferences, or where the population is very small and specific. An effective purposive sample must have clear criteria and rationale for inclusion. Always make sure to describe your inclusion and exclusion criteria and beware of observer bias affecting your arguments.

4. Snowball sampling

If the population is hard to access, snowball sampling can be used to recruit participants via other participants. The number of people you have access to “snowballs” as you get in contact with more people. The downside here is also representativeness, as you have no way of knowing how representative your sample is due to the reliance on participants recruiting others. This can lead to sampling bias .

5. Quota sampling

Quota sampling relies on the non-random selection of a predetermined number or proportion of units. This is called a quota.

You first divide the population into mutually exclusive subgroups (called strata) and then recruit sample units until you reach your quota. These units share specific characteristics, determined by you prior to forming your strata. The aim of quota sampling is to control what or who makes up your sample.

If you want to know more about statistics , methodology , or research bias , make sure to check out some of our other articles with explanations and examples.

• Student’s  t -distribution
• Normal distribution
• Null and Alternative Hypotheses
• Chi square tests
• Confidence interval
• Quartiles & Quantiles
• Cluster sampling
• Stratified sampling
• Data cleansing
• Reproducibility vs Replicability
• Peer review
• Prospective cohort study

Research bias

• Implicit bias
• Cognitive bias
• Placebo effect
• Hawthorne effect
• Hindsight bias
• Affect heuristic
• Social desirability bias

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A sample is a subset of individuals from a larger population . Sampling means selecting the group that you will actually collect data from in your research. For example, if you are researching the opinions of students in your university, you could survey a sample of 100 students.

In statistics, sampling allows you to test a hypothesis about the characteristics of a population.

Samples are used to make inferences about populations . Samples are easier to collect data from because they are practical, cost-effective, convenient, and manageable.

Probability sampling means that every member of the target population has a known chance of being included in the sample.

Probability sampling methods include simple random sampling , systematic sampling , stratified sampling , and cluster sampling .

In non-probability sampling , the sample is selected based on non-random criteria, and not every member of the population has a chance of being included.

Common non-probability sampling methods include convenience sampling , voluntary response sampling, purposive sampling , snowball sampling, and quota sampling .

In multistage sampling , or multistage cluster sampling, you draw a sample from a population using smaller and smaller groups at each stage.

This method is often used to collect data from a large, geographically spread group of people in national surveys, for example. You take advantage of hierarchical groupings (e.g., from state to city to neighborhood) to create a sample that’s less expensive and time-consuming to collect data from.

Sampling bias occurs when some members of a population are systematically more likely to be selected in a sample than others.

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How to Write the Rationale for a Research Proposal

Table of Contents

Writing a research proposal can be intimidating, especially when you are expected to explain the rationale behind your project. This article will help you learn how to write the rationale for a research proposal to provide justification for why it should be pursued. A good rationale should give readers an understanding of why your project is worth undertaking and how it will contribute to existing knowledge. It should outline any practical implications that could come from your work. By thoroughly preparing this section of your proposal , you will increase the chances of having your research approved.

What Is a Rationale in Research?

A research rationale provides a detailed explanation of why a study is necessary and should be carried out. It convinces the reader or examiner of the importance of the research by outlining its relevance, significance, and potential contribution to existing knowledge. Additionally, it helps transition from the research problem to the methods used in the study, connecting both elements into one comprehensive argument. The research rationale justifies why the researcher chose to conduct this particular study over any other possible alternative studies.

Why Is a Research Rationale Important?

A well-written rationale can help demonstrate your commitment to the project. It can convince reviewers that you have put thought into developing a high-quality research plan. When composing this section, focus on the scientific merit of your proposed study by providing clear and concise reasons for conducting the research. Your goal is to communicate the potential benefits of your project and show that you understand its limitations. Include sufficient detail about the methods you plan to use, any ethical considerations to consider, and how you will evaluate your results. Explaining why your research is important and necessary is essential for getting approval from funding bodies or academic institutions. Your rationale should provide a convincing argument for why the project needs to be conducted. The rationale must make it clear that there are potential benefits that justify its costs. Consider the broader impact of your work and describe how it could contribute to furthering knowledge in the field.

The rationale for research is also known as the justification of the study. Make a mention of the following points while writing the rationale for a research proposal:

Background on All Previous Research on the Subject of Your Study

It is important to include background information on what research has already been done on the study topic. This will help to build a foundation for understanding the current knowledge, open questions, and gaps.

The Open Questions of the Study

Highlighting the open questions related to the study topic helps to identify potential areas for further exploration. It gives readers an understanding of where new research could be helpful. It is essential to state these questions to have clear objectives and goals for the research proposal.

Identify the Gaps in Literature

Identifying literature gaps helps highlight areas that have not yet been studied. This provides the opportunity to add new information and understanding to the field. By including these points in the rationale, the writer can showcase how his work will contribute to existing research.

Highlight the Significance of Addressing These Gaps

Emphasizing why it is important to address those gaps is vital in any research proposal. It allows readers to understand why this particular project needs to be undertaken. By clearly outlining why addressing these gaps is crucial, the writer can successfully argue why his proposed project should be given consideration.

A rationale for a research proposal can help convince the reader of the importance and relevance of your study. This article explains the importance of a rationale and discusses the key elements to learn how to write the rationale for a research proposal . Following these tips will let you create a powerful research rationale that will help convince others of the value of your project.

Abir Ghenaiet

Abir is a data analyst and researcher. Among her interests are artificial intelligence, machine learning, and natural language processing. As a humanitarian and educator, she actively supports women in tech and promotes diversity.

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FDA Rationale for Piperacillin Tazobactam Breakpoints for Pseudomonas aeruginosa

FDA has completed their review of the rationale document titled, “Piperacillin-Tazobactam Breakpoints for Pseudomonas aeruginosa ” (MR15, January 2024), submitted by the Clinical and Laboratory Standards Institute (CLSI) to the public docket, FDA-2017-N-5925-0012, in January 2024.

Piperacillin-tazobactam is a combination of piperacillin, a penicillin-class antibacterial and tazobactam, a β-lactamase inhibitor, indicated for the treatment of:

• Intra-abdominal infections in adult and pediatric patients 2 months of age and older
• Nosocomial pneumonia in adult and pediatric patients 2 months of age and older
• Skin and skin structure infections in adults
• Female pelvic infections in adults
• Community-acquired pneumonia in adults

In adults with creatinine clearance greater than 40 mL/min, piperacillin-tazobactam is approved at 4.5 g every 6 hours administered by intravenous infusion over 30 minutes for nosocomial pneumonia, and at 3.375 g every 6 hours as a 30-minute infusion for all other indications.

CLSI notes that since the revision of piperacillin-tazobactam breakpoints in 2012, multiple studies using modern PK/PD methods highlighted a low probability of target attainment (PTA) at minimal inhibitory concentrations (MIC) > 16 mcg/mL necessitating updating the piperacillin-tazobactam breakpoints against P. aeruginosa . The updated breakpoints were published in the 33rd ed. of CLSI M100 in 2023. The current FDA breakpoints and the historical and current CLSI breakpoints are presented in Table 1.

Table 1. Current FDA and Current and Historical CLSI Piperacillin-Tazobactam MIC and Zone Diameter Breakpoints for P. aeruginosa

Breakpoints as of the time of the submission of the CLSI rationale document. MIC: minimal inhibitory concentration; R: resistant; S: susceptible; I: intermediate.

The current CLSI susceptible breakpoint is based on a piperacillin-tazobactam dosage regimen of 4.5 g administered every 6 hours as a 30-minutes or 3-hour infusion. FDA does not specify a dosage regimen for the piperacillin-tazobactam breakpoint on its susceptibility test interpretative criteria (STIC) website.

CLSI provided the following rationale to support their revised breakpoints:

• Piperacillin-tazobactam epidemiologic cutoff value (ECV) for P. aeruginosa of 16 mcg/mL. CLSI notes that breakpoints set below the ECV reduce the ability of antimicrobial susceptibility testing methods to reliably distinguish between interpretive categories, potentially leading to unacceptably high error rates. CLSI notes that the P. aeruginosa ECV was one log 2 dilution higher than the Enterobacterales ECV and corresponding susceptibility breakpoint of ≤ 8/4 mcg/mL, thereby preventing breakpoint harmonization across these organism groups.
• PK-PD data: The CLSI analyzed several studies investigating piperacillin-tazobactam achievable MIC targets for ≥ 90% probability of target attainment (PTA) at ≥ 50% fT >MIC . The studies used various dosage regimens and infusion durations. Extended-infusion dosing over 3 to 4 hours of the 4.5 g dose every 6 to 8 hours more reliably achieved ≥ 90% PTA at MICs ≤ 16/4 mcg/mL. The CLSI notes that no dosage regimen demonstrated acceptable PTA at MICs ≥ 32/4 mcg/mL in patients with normal renal function regardless of study methodology or infusion duration.
• Clinical data indicating a clinical failure signal for P. aeruginosa isolates with MICs ≥ 32 mcg/mL treated with piperacillin-tazobactam. 1,2,3,4 The CLSI acknowledged limitations of the four analyzed studies related to their retrospective design, likely selection bias, generally small sample size and variable piperacillin-tazobactam dosing.

The CLSI concludes that MICs ≥32/4 mcg/mL are associated with unacceptably low PTA and increased mortality, and that the intermediate breakpoint of 32/4 mcg/mL for piperacillin-tazobactam against P. aeruginosa is meant only to account for technical variability inherent to susceptibility testing, does not imply dose-dependent susceptibility, and administration of piperacillin-tazobactam against P. aeruginosa isolates with MIC 32/4 mcg/mL is not advised. 5

FDA reviewed the submitted information and agrees that provided data support lowering the breakpoints for piperacillin-tazobactam against P. aeruginosa . However, FDA declines to recognizes the CLSI breakpoints for the reasons described below.

FDA has concluded that an MIC of ≤ 16/4 mcg/mL is appropriate as a susceptible-dose dependent (SDD) breakpoint contingent on the dosage regimen of 4.5 g every 6 hours as a 3-hour infusion with a susceptible breakpoint at 8/4 mcg/mL. This conclusion is based on two lines of evidence. First, a clinical failure signal for P. aeruginosa isolates with MICs of ≥32/4 mcg/mL treated with piperacillin-tazobactam. Second, PTA data demonstrating that the standard 0.5-hour infusion of PTZ does not achieve ≥90% PTA at an MIC of 16/4 mcg/mL even when the highest approved dose of 4.5 g every 6 hours is used. Considering the limitations of the provided PTA analyses, which are described below, FDA recommends using the maximum approved dose of 4.5 g (rather than 3.375 g) every 6 hours with an extended infusion over 3 hours to improve PTA at MIC of 16/4 mcg/mL by maximizing the fT C> piperacillin-tazobactam MIC /τ in support of the SDD breakpoint. FDA acknowledges that the piperacillin-tazobactam ECV for P. aeruginosa is 16/4 mcg/mL, but because the MIC of 16/4 mcg/mL still falls within the susceptible range, the introduction of the SDD breakpoint does not result in splitting of the wild-type population.

As for the MIC of 32/4 mcg/mL, FDA concludes that the available data indicate that this MIC is more consistent with a resistant rather than an intermediate breakpoint. FDA notes that an intermediate breakpoint defines isolates with MICs or zone diameters that approach usually attainable blood and tissue levels, and while clinical response rates for intermediate isolates may be lower than for susceptible ones, an intermediate breakpoint implies a reasonable expectation of clinical success. However, the provided data demonstrate that the MIC of 32/4 mcg/mL for PTZ against P. aeruginos a is associated with unreliable and unacceptably low drug exposures, and increased mortality in clinical studies.

Specifically, a 67% PTA at MICs ≥32/4 mg/L with 4.5 g every 6 hours as a 3-hour infusion versus <40% PTA at MICs of ≥ 32/4 mg/L with 4.5 g every 6 hours as a 0.5 hour infusion is predicted in patients with CrCl 41-120 mL/min by Thabet et al. 6 We note that this simulation study excluded patients with CrCl > 120 mL/min and used a virtual population generation method that has limitations. This is significant as patients with sepsis may have augmented renal clearance and predicted piperacillin exposures would be even less favorable in achieving the PK-PD target in such patients at an MIC of 32/4 mcg/mL. Similarly, the above reported probabilities cannot be universally applied to all patients within the 41-120 mL/min CrCl range as patients with normal CrCl (90-120 mL/min) will have lower predicted piperacillin exposures resulting in lower probabilities of achieving the PK-PD target in such patients at an MIC of 32/4 mcg/mL versus those with some degree of renal impairment (41-89 mL/min). FDA also notes that available clinical data do not allow evaluating the differences in clinical outcomes associated with MIC of 32/4 mcg/mL vs MICs > 32/4 mcg/mL. Thus, isolates at an MIC of ≥ 32/4 mcg/mL would not likely be inhibited by the usually achievable drug concentrations with the 4.5 g every 6 hours as a 3-hour infusion dosage regimen and clinical efficacy against isolates at an MIC of ≥ 32/4 mcg/mL has not been reliably shown.

FDA acknowledges that the intermediate category includes a buffer zone for inherent variability in test methods to mitigate major discrepancies in interpretations. However, in the case of PTZ for P. aeruginosa , the intermediate breakpoint of 32/4 may not provide an intended buffer given that isolates with an MIC of 32/4 mcg/mL should be considered resistant and their reporting as susceptible would represent a major misclassification.

FDA notes several limitations of the provided PK/PD data. The relied upon PK-PD target of piperacillin 50% fTC>MIC/τ is not sufficiently justified. While FDA acknowledges that this target has been used in several published PTA analyses for piperacillin-tazobactam, the target has not been adequately evaluated for P. aeruginosa . The commonly cited publication supporting this target evaluated the relationship between the time above the MIC and bacteriologic cure for beta-lactams against S. pneumoniae and H. influenzae rather than P. aeruginosa . 7 Only one study referenced in the CLSI rationale document described a range of piperacillin-tazobactam MIC-based PK-PD exposures achieved in a murine P. aeruginosa infection model commonly accepted for PK/PD target characterization. 8 The study, however, used an immunocompetent rather than neutropenic mouse model, which would be expected to result in greater bacterial killing than a neutropenic mouse model, but achieved less than 1 log10 decrease in P. aeruginosa bacterial burden, which would not be considered adequate for serious infections. The other referenced studies either tested pathogens other than P. aeruginosa or did not characterize the PK-PD target. FDA also notes that a target of 60% fT C>MIC was reported to be associated with improved survival in patients with P. aeruginosa bacteremia. 9

Given the limitations of the PTA analyses and an increase in mortality associated with the MIC of 32/4 mcg/mL, FDA has concluded that a more cautious approach to establishing the piperacillin-tazobactam breakpoints for P. aeruginosa is warranted and updates the breakpoints as shown below. In its calculations of zone diameter breakpoints, FDA used an MIC of 16/4 as an intermediate category to arrive at acceptable error rates.

Piperacillin-Tazobactam MIC and Zone Diameter Breakpoints for P. aeruginosa

S = Susceptible; SDD=Susceptible-dose dependent; I = Intermediate; R = Resistant

a Susceptible-dose dependent breakpoints are based on a dosage regimen of 4.5 grams every 6 hours as a 3-hour infusion in patients with creatinine clearance 41-120 mL/min.

1 Tam VH, Gamez EA, Weston JS, et al. Outcomes of bacteremia due to Pseudomonas aeruginosa with reduced susceptibility to piperacillin-tazobactam: implications on the appropriateness of the resistance breakpoint. Clin Infect Dis. 2008;46(6):862-867. doi:10.1086/528712 2 Tamma PD, Turnbull AE, Milstone AM, Hsu AJ, Carroll KC, Cosgrove SE. Does the piperacillin minimum inhibitory concentration for Pseudomonas aeruginosa influence clinical outcomes of children with pseudomonal bacteremia? Clin Infect Dis. 2012;55(6):799-806. doi:10.1093/cid/cis545 3 Yamagishi Y, Terada M, Ohki E, Miura Y, Umemura T, Mikamo H. Investigation of the clinical breakpoints of piperacillin-tazobactam against infections caused by Pseudomonas aeruginosa . J Infect Chemother. 2012;18(1):127-129. doi:10.1007/s10156-011-0285-3 4 Gentry CA, Williams RJ, 2nd. A propensity score-matched analysis of the impact of minimum inhibitory concentration on mortality in patients with Pseudomonas aeruginosa bacteraemia treated with piperacillin/tazobactam. Int J Antimicrob Agents. 2017;49(3):333-338. doi:10.1016/j.ijantimicag.2016.11.018 5 https://www.regulations.gov/comment/FDA-2017-N-5925-0032 6 Thabit AK et al. Simplifying Piperacillin/Tazobactam Dosing: Pharmacodynamics of Utilizing Only 4.5 or 3.375 g Doses for Patients With Normal and Impaired Renal Function. J Pharm Pract. 2017 Dec;30(6):593-599. 7 Craig WA. Pharmacokinetic/pharmacodynamic parameters: rationale for antibacterial dosing of mice and men. Clin Infect Dis. 1998 Jan;26(1):1-10. 8 Bulik CC, Tessier PR, Keel RA, Sutherland CA, Nicolau DP. In vivo comparison of CXA-101 (FR264205) with and without tazobactam versus piperacillin-tazobactam using human simulated exposures against phenotypically diverse gram-negative organisms. Antimicrob Agents Chemother. 2012;56(1):544-549. doi:10.1128/aac.01752-10 9 Tannous E et al. Time above the MIC of Piperacillin-Tazobactam as a Predictor of Outcome in Pseudomonas aeruginosa Bacteremia. Antimicrob Agents Chemother. 2020 Jul 22;64(8):e02571-19.