If your assignment says "follow IMRaD structure" and you're squinting at the acronym wondering what you're supposed to do, you're not alone. IMRaD structure is the four-part skeleton — Introduction, Methods, Results, Discussion — that organizes most empirical research papers in biology, psychology, nursing, medicine, and the social sciences. It's not a writing style. It's a reader-expectation contract. Your audience knows exactly where to look for your hypothesis, your sample size, your p-values, and your interpretation, because every paper in the field puts them in the same place.
PaperDraft is a writing assistant, not a paper generator — the draft is your starting point, not your submission. You are responsible for editing, verifying sources, and following your school's academic integrity policy.
This guide walks through each IMRaD section, what goes where, field-specific variations, and where the format breaks down (hint: humanities). For a broader view of paper organization, see our pillar on research paper structure.
What IMRaD Stands For and Why It Exists
IMRaD is short for Introduction, Methods, Results, and Discussion. It became the dominant format in scientific publishing in the mid-20th century because it mirrors the logic of empirical inquiry: you state a question, explain how you answered it, show what you found, and interpret what it means.
The structure solves a reader problem. A reviewer skimming 40 manuscripts doesn't want to hunt for the sample size or the effect size. They know Methods comes third from the top, Results comes fourth, and the numbers are in tables right after the narrative. Consistency reduces cognitive load for everyone who reads academic work.
The four sections, in order
- Introduction. Why this question matters, what's already known, what gap you're filling, and what your hypothesis or research question is.
- Methods. Exactly how you collected and analyzed your data — sample, instruments, procedure, analysis plan. Written so a reader could replicate the study.
- Results. What you found. Numbers, tables, figures, and narrative that describes them. No interpretation here.
- Discussion. What the results mean, how they fit with prior work, what the limitations are, and what future research should do.
Some fields add sections like Abstract, Literature Review (as a separate section rather than folded into Introduction), Conclusion, or Implications. The core four are non-negotiable in empirical work.
What Goes in Each Section (With Examples)
The hardest part of IMRaD isn't remembering the names. It's knowing what belongs where — and what absolutely does not.
Introduction
Open with the problem, narrow to the gap, land on your question or hypothesis. A common template:
- Broad context (why this topic matters).
- What prior research has established.
- What's still unknown or contested (the gap).
- Your specific research question and hypothesis.
Example opening (nursing): "Postoperative delirium affects up to 50% of elderly surgical patients and is associated with increased mortality (Smith, 2022). While pharmacological prevention has been studied extensively, non-pharmacological interventions remain under-examined. This study examined whether a structured family-presence protocol reduces delirium incidence in patients aged 65+ undergoing elective cardiac surgery."
Methods
Methods is the most boring and the most important section. It should read like a recipe. Include participants, materials or instruments, procedure, and analysis approach. If you used statistical software, name it and the version.
- Participants: "We recruited 124 undergraduates (68 female, 56 male, mean age 19.4) from a large public university in the Midwest."
- Procedure: "Participants completed the survey online via Qualtrics between March and May 2025."
- Analysis: "We used a two-way ANOVA in R (version 4.3) to test the interaction between condition and gender."
If someone in your field can't replicate your study from the Methods section, it's too thin.
Results
Report what you found. No speculation, no "this suggests." Just the numbers and what they do. Tables and figures go here, each with a clear caption.
Example (psychology): "Participants in the mindfulness condition reported lower anxiety scores (M = 14.2, SD = 3.1) than those in the control condition (M = 18.7, SD = 4.0). This difference was statistically significant (p < .01)."
Write "p less than .01" if you want to avoid formatting headaches, or escape the less-than sign.
Discussion
Discussion is where interpretation lives. State what your results mean, connect them to prior literature, acknowledge limitations, and suggest next steps. A common four-move structure: restate the key finding, compare to prior work, acknowledge limitations, point to future research.
For a deeper dive, see writing the discussion section.
Where IMRaD Breaks Down
IMRaD is empirical. If your paper isn't reporting original data, the structure doesn't fit.
Humanities papers (literary analysis, history, philosophy) use a thesis-driven structure — introduction, argument sections organized by claim or theme, conclusion. There are no "Methods" because the method is close reading or archival work, not data collection.
Literature reviews use a synthesis structure — thematic, chronological, or methodological — not IMRaD.
Theoretical or conceptual papers argue for a framework rather than test one, so Methods and Results collapse into an argument.
If your instructor says "follow IMRaD" but your paper isn't empirical, ask. They might mean "use section headings" in a looser sense.
Structure clear but staring at a blank Methods section? PaperDraft gives you a structured first draft — thesis stub, IMRaD skeleton, opening sections in academic register — so you can spend your time analyzing your results instead of formatting. It's a drafting assistant, not a submission. Try PaperDraft — free
Common Mistakes Students Make With IMRaD
A few traps show up in almost every first draft.
Interpreting in the Results section. You report a mean and can't resist adding "which suggests mindfulness works." Stop. That sentence belongs in Discussion. Results describes, Discussion interprets.
Skipping the gap in the Introduction. You tell the reader everything that's been studied, then pivot to your study with no bridge. The Introduction has to end with "and here's what we still don't know — which is what this paper addresses."
Under-specifying Methods. "We surveyed students" is not a method. How many? Which students? What survey? Administered how? If a replication attempt would fail from ambiguity, your Methods section is incomplete.
Over-padding Discussion with speculation. The Discussion should connect findings to literature and limitations — not list ten unrelated "future directions" to hit a word count.
Mismatching hypothesis and analysis. If you hypothesized an interaction effect, run and report the interaction — not just main effects. Reviewers notice.
How a Drafting Assistant Fits
A drafting tool can sketch the IMRaD skeleton — heading hierarchy, section stubs with placeholder topic sentences, and opening paragraphs that match academic register. That saves you from the cold start. What it can't do is write your actual Methods (you ran the study, not it), report your actual Results (you have the data), or interpret your findings honestly in the Discussion. PaperDraft handles the structure and the tone. You handle the analysis, the numbers, and the claims that make the paper yours.
FAQ
Does every science paper use IMRaD?
Most empirical papers do. Review articles, theoretical papers, and case studies often deviate. Check three recent articles in your target journal before drafting.
Can I have subsections inside each IMRaD section?
Yes, and you should in longer papers. Methods often splits into Participants, Materials, Procedure, and Analysis. Discussion often includes subsections for limitations and future directions.
Where does the literature review go in IMRaD?
In most fields, the literature review is folded into the Introduction. In some (nursing, education), it gets its own section between Introduction and Methods. Check your discipline.
Is the Abstract part of IMRaD?
No. The Abstract is a separate 150-250 word summary that appears before the Introduction. It's often written last.
What order should I draft the sections in?
Most researchers draft Methods and Results first (they're most concrete), then Introduction and Discussion. The Abstract comes last.
Once your IMRaD skeleton is solid, the rest of the paper fits into it. For the next piece — actually writing the numbers and narrative in the Results section — see our guide on writing the results section.