What goes in each IMRaD section?

Introduction: the background, the gap, and your aim or hypothesis. Methods: enough detail to reproduce the study — design, participants, materials, procedure, analysis. Results: the findings reported factually with tables and figures, no interpretation. Discussion: what the results mean, how they relate to prior work, the limitations, and the implications.

What is the IMRaD hourglass?

The hourglass describes the shape of focus across a paper. The Introduction starts broad and narrows to your specific question; the Methods and Results are narrow and specific; the Discussion widens back out from your findings to their broader significance. Picturing the hourglass helps you pitch each section at the right level of generality.

What is the most common IMRaD mistake?

Mixing interpretation into the Results, or repeating raw results in the Discussion. Results should report what you found without spinning it; the Discussion interprets. Blurring the two makes the paper hard to follow and lets bias creep in unnoticed.

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IMRaD structure explained

Q: What does IMRaD stand for?

IMRaD stands for Introduction, Methods, Results, and Discussion — the standard structure for empirical research papers. The Introduction says why the study was done, Methods says how, Results says what was found, and Discussion says what it means. An abstract precedes it and references follow.

By Dr. Rafiq Muhammad, MD, PhD · Updated June 2026

IMRaD — Introduction, Methods, Results, Discussion — is the standard skeleton of an empirical paper. Each section answers one question: why? how? what? so what? Keep those four jobs separate and the paper almost writes itself; blur them and reviewers get lost.

The four sections

Section	Answers	Contains
Introduction	Why?	Background, the gap, your aim or hypothesis
Methods	How?	Design, participants, materials, procedure, analysis — enough to reproduce
Results	What?	The findings, factual, with tables/figures — no interpretation
Discussion	So what?	Meaning, links to prior work, limitations, implications

The hourglass shape

Introduction ▼ broad → narrow (down to your question) Methods ▮ narrow & specific Results ▮ narrow & specific Discussion ▲ narrow → broad (out to the significance)

Picture the focus as an hourglass: the Introduction opens wide and funnels down to your specific question; Methods and Results stay tight and concrete; the Discussion widens back out from your findings to what they mean for the field. Getting the level of generality right in each section is half of good structure.

Keep Results and Discussion apart

The most common IMRaD mistake is bleeding interpretation into the Results — or re-reporting raw numbers in the Discussion. Results report; Discussion interprets. State what you found without spin in Results (this is also where your statistics and p-values live), then explain what it means in the Discussion. Keeping the wall up keeps bias visible and the paper readable.

Methods and Results rest on your study design — the research design overview and literature review guide feed your Methods and Introduction directly.

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Frequently asked questions

What does IMRaD stand for?

Introduction, Methods, Results, and Discussion — the standard structure for empirical research papers.

What goes in each section?

Introduction = why; Methods = how (reproducibly); Results = what (factually); Discussion = what it means.

What is the hourglass?

Broad Introduction → narrow Methods/Results → broad Discussion — the shape of focus across the paper.

Most common mistake?

Mixing interpretation into Results, or repeating results in the Discussion. Results report; Discussion interprets.

How to write an abstract → Open the Citation Formatter →