Key Takeaways
- Most research papers follow the IMRaD structure: Introduction, Methods, Results, and Discussion. Each section has a specific purpose and a predictable content.
- The introduction sets up the problem. The methods describe what you did. The results present what you found. The discussion explains what it means.
- Additional sections include the abstract (a self-contained summary), the conclusion (key findings and future directions), and the reference list.
- Structural consistency helps reviewers evaluate your paper efficiently. Deviating from the expected structure without justification creates friction.
- PM Proofreading’s journal editing service ensures your paper is well-structured, clearly written, and formatted for your target journal.
A research paper is not an essay. It is not a narrative. It follows a standardised structure that allows reviewers, editors, and readers to find specific information quickly. If the reviewer wants to check your sample size, they go to the methods section. If they want to see your key findings, they go to the results. If they want to understand your contribution, they read the discussion.
This predictable structure exists for a reason: it makes the peer review process efficient and ensures that readers from different backgrounds can navigate the paper without guessing where to find what they need.
This guide covers the standard structure of a research paper, what each section should contain, and the common structural mistakes that lead to reviewer criticism.
The IMRaD Structure
IMRaD stands for Introduction, Methods, Results, and Discussion. It is the standard structure for empirical research papers in science, engineering, social sciences, and health sciences. Most journals that publish original research expect this format or a close variation of it.
The logic of IMRaD follows the research process itself. The introduction asks the question. The methods describe how you answered it. The results present the answer. The discussion explains what the answer means. Each section builds on the previous one, and together they tell the complete story of your research.
Abstract
The abstract is a self-contained summary of the entire paper, typically 150 to 300 words. It covers background/purpose, methodology, key results, and conclusions. Write it last, after the full paper is complete. For a detailed guide, see our post on how to write a research abstract.
Introduction
The introduction sets the context, presents the research problem, and states the objectives. It moves from broad context to specific focus: what is the general topic, what does the existing literature say, what is the gap, and what does your study aim to do?
Keep the introduction focused. It is not a literature review. It references key prior work to establish the gap, but the detailed literature analysis belongs in a separate section (or, in shorter papers, is woven into the introduction more selectively). For a detailed guide, see our post on writing an effective introduction.
Literature Review
In some disciplines, the literature review is a subsection of the introduction. In others (particularly in social sciences and theses), it is a standalone section. The literature review synthesises existing research on your topic, identifies themes and patterns, highlights areas of agreement and disagreement, and builds toward the gap your study addresses.
The key difference between a good and a poor literature review is synthesis vs summary. A summary lists studies one by one: “Smith (2020) found… Jones (2021) found…” A synthesis groups them by theme and compares them: “While several studies have found a positive relationship between X and Y (Smith, 2020; Ahmed, 2022), others have reported no significant association (Jones, 2021; Lee, 2023), suggesting that contextual factors may moderate the relationship.”
For a step-by-step approach, see our guide on how to conduct a systematic literature review.
Methods
The methods section describes what you did in enough detail that another researcher could replicate your study. It typically covers research design, population and sampling, data collection instruments and procedures, data analysis methods, and ethical considerations.
Use the past tense throughout: “participants were recruited,” “data were collected,” “the model was tested.” Be specific. “A large number of participants” is vague. “A total of 247 participants (148 female, 99 male, mean age 32.4 years)” is specific.
For guidance on choosing between qualitative and quantitative methods, see our comparison guide.
Results
The results section presents your findings without interpretation. Report what you found, supported by tables, figures, and statistical values. Do not explain why you found it (that belongs in the discussion) or whether it agrees with previous studies (also the discussion).
Organise the results by research question or hypothesis. If you have three research questions, present the results in the same order. This makes it easy for the reviewer to check whether all questions are addressed.
For quantitative papers, report the statistical test used, the test statistic, degrees of freedom, p-value, and effect size. “A significant positive correlation was found between X and Y (r = 0.42, p < 0.001)." For qualitative papers, present themes with supporting quotes from participants.
Discussion
The discussion is the most intellectually demanding section. It interprets your results, explains what they mean, compares them to existing literature, discusses limitations, and suggests implications and future research directions.
Start with a brief summary of your key findings (one to two sentences). Then discuss each finding in relation to the literature: does it agree with previous studies? Does it contradict them? Why might the results differ? What are the theoretical and practical implications?
Discuss the limitations of your study honestly. No study is perfect. Acknowledge limitations in sample size, methodology, generalisability, or data quality. Reviewers will identify these limitations anyway; addressing them proactively demonstrates intellectual maturity.
End with implications for practice, policy, or theory, and suggest specific directions for future research.
Conclusion
The conclusion summarises the key findings in relation to the research objectives, states the main contribution, and provides a final statement on the significance of the work. It should not introduce new information or new arguments. Keep it concise: one to two paragraphs for a journal paper.
References
The reference list includes every source cited in the paper, formatted in the citation style required by your target journal. Every in-text citation must have a corresponding reference list entry, and every reference list entry must be cited in the text. Use a reference manager (Zotero, Mendeley, EndNote) to maintain consistency.
Conclusion: Structure Creates Clarity
A well-structured paper is easier to write, easier to review, and easier to read. Follow the IMRaD format unless your journal specifies an alternative. Let each section do its job: the introduction asks the question, the methods describe the approach, the results present the answer, and the discussion explains the meaning. Keep the boundaries between sections clean, and your paper will communicate your research effectively.
Ready to submit your paper? PM Proofreading’s journal editing service ensures your paper is well-structured, clearly written, and formatted for your target journal. Every order includes a free language editing certificate. Upload your manuscript and get a quote.
Further Reading
- How to Write an Effective Introduction Section
- How to Write the Perfect Research Abstract
- How to Conduct a Systematic Literature Review
- How to Find the Right Journal for Your Research Paper
Frequently Asked Questions
What does IMRaD stand for?
IMRaD stands for Introduction, Methods, Results, and Discussion. It is the standard structure for empirical research papers in most scientific, engineering, social science, and health science journals. Some variations include a separate literature review section and a conclusion section.
Should the literature review be part of the introduction or a separate section?
It depends on the journal and the discipline. In many science and engineering journals, the literature review is woven into the introduction. In social sciences, education, and health sciences, it is often a standalone section. For theses, it is almost always a separate chapter. Check your target journal’s structure by looking at recently published articles.
How long should each section of a research paper be?
There is no fixed rule, but a common guideline for a 5,000-word paper is: introduction (500-800 words), literature review (800-1,200 words if separate), methods (600-1,000 words), results (800-1,200 words), discussion (800-1,200 words), conclusion (200-400 words). The results and discussion are typically the longest sections. Check your journal’s word limit and structure guidelines.
Can I combine the results and discussion sections?
Yes, some journals allow or prefer a combined “Results and Discussion” section. This format presents each finding followed immediately by its interpretation and comparison to previous literature. It works well for papers with multiple experiments or when the results are best understood in context. Check your target journal’s author guidelines for their preference.
