A research abstract is a concise, self-contained summary of an entire study — usually 150 to 300 words — that lets a reader grasp the purpose, methods, findings and conclusion without reading the full paper. It is often the only part indexed, read or searched, so it carries disproportionate weight.
Follow the steps below to write one that is accurate, complete and discoverable.
Step 1: Decide structured or unstructured
Two formats exist:
- Structured — explicit labelled sections (Background, Methods, Results, Conclusion). Common in medicine and many sciences; easy to scan.
- Unstructured — a single continuous paragraph covering the same ground without headings. Common in the humanities and some social sciences.
Check the target journal’s instructions first; the choice is usually dictated, not free.
Step 2: Cover the IMRaD content
Whether structured or not, a strong abstract mirrors the IMRaD shape of the paper itself — Introduction, Methods, Results and Discussion. Map each to a sentence or two:
| IMRaD element | Abstract content |
|---|---|
| Introduction | Background and the gap or question |
| Methods | Design, participants, what was measured |
| Results | Key findings, including direction of effect |
| Discussion | What it means and the main conclusion |
For the full-paper version of this shape, see the anatomy of a journal article.
Step 3: Respect the word limit
Most journals set a limit between 150 and 300 words; conferences are often tighter. Write to the limit deliberately rather than trimming at the end — every sentence should earn its place. Cut background that the reader can infer, and never include citations, figures or undefined abbreviations.
Step 4: Choose keywords
Most journals ask for three to six keywords beneath the abstract. Choose terms a searcher would actually type, avoid repeating words already in the title where possible, and prefer recognised vocabulary. Controlled terms from our dictionary help here by aligning your keywords with terminology others use.
Step 5: Write it last, edit it hardest
Draft the abstract after the paper is complete, so it reflects what you actually found, then edit it more carefully than any other section because it is the most read. Read it aloud; if a sentence cannot stand alone, it is not abstract-ready. Our for authors guidance covers the final pre-submission pass.
Common mistakes to avoid
- Promising results in vague terms (“results are discussed”) instead of stating them.
- Including information not present in the paper.
- Adding citations or references — the abstract must stand alone.
- Exceeding the word limit or padding to reach it.
- Using undefined acronyms.
Where your study reports an observational design, state it precisely — see cohort and case-control study designs for the terminology. And keep references in the body, formatted to your style; our guide to citation styles compared covers the options.
How the abstract fits the research output
The abstract is the front door to your output’s metadata. Contributor roles via CRediT and controlled terms in our dictionary describe the rest, making the work discoverable and attributable. Browse more in research outputs.
Frequently asked questions
How long should an abstract be?
Usually 150 to 300 words, but always follow the specific journal or conference limit, which can be shorter.
Should I write the abstract first or last?
Last. Drafting it after the paper is finished ensures it accurately reflects the methods and findings.
Can I include references in an abstract?
Generally no. An abstract must be self-contained, so avoid citations, footnotes and figures.
What is the difference between structured and unstructured abstracts?
A structured abstract uses labelled sections such as Background and Methods; an unstructured abstract covers the same content as a single flowing paragraph. The journal usually specifies which to use.