How to Write an Abstract

What an Abstract Is For

The abstract is the most-read part of your paper and, for most readers, the only part. It appears in search results, in indexing databases and in reading lists, usually separated from the full text.

That separation drives every rule that follows. The abstract must stand alone: no citations, no undefined abbreviations, no references to "Table 2", and no sentence that depends on having read the introduction.

Its job is to let a reader decide, in under a minute, whether to read the paper. It is not a teaser. Withholding the finding to create interest simply loses the reader.

What It Must Contain

• The problem — what question the work addresses and why it matters
• The approach — what you did, in enough detail to judge its suitability
• The principal findings — the actual results, with key numbers
• The implication — what follows for the field or for practice

An abstract that describes the problem and method but not the findings is the single commonest fault. The reader wants to know what you found.

A Sentence-by-Sentence Recipe

1. Context — one sentence establishing the area and the problem.
2. Gap — one sentence on what is not yet known or resolved.
3. Aim — one sentence stating what this study set out to do.
4. Method — one or two sentences: design, data, analysis.
5. Results — two or three sentences with the actual findings and numbers.
6. Conclusion — one sentence on what it means.
7. Implication — one optional sentence on what should follow.

Write it last, after the paper is finished. An abstract drafted before the results are settled almost always promises something the paper does not deliver.

Structured vs Unstructured

A structured abstract uses explicit labels — Background, Methods, Results, Conclusions — and is common in health and social science. An unstructured abstract is a single paragraph covering the same ground without labels, and is common in engineering, computing and the humanities.

Use whichever the target journal specifies. The content requirements are identical; only the signposting differs.

Length and Language

Most journals specify between 150 and 300 words. Check the submission portal for the current requirement rather than relying on a figure quoted elsewhere.

• Use past tense for what you did and found; present tense for what is generally true
• Prefer active constructions where they are shorter
• Spell out abbreviations on first use, or avoid them entirely
• Remove throat-clearing: "This paper aims to investigate" is usually replaceable with the finding itself

Common Mistakes

Worked Example

Weak: "This paper aims to study the important problem of energy consumption in buildings. A method is proposed. Results are presented and discussed. The proposed approach is found to be effective."

Every sentence is content-free: no setting, no method, no numbers, no finding.

Stronger: "Heating accounts for a large share of energy use in older institutional buildings, but retrofit decisions are usually made without measured baseline data. We instrumented four university buildings over two heating seasons and compared measured consumption against the models used to justify their retrofits. Measured savings were consistently below modelled projections, with the gap widening in buildings with mixed occupancy patterns. Retrofit appraisals that rely on modelled savings alone may overstate returns, and we recommend a measured baseline period before commitment."

Final Checks

• Readable on its own, with no reference to the full text
• States the actual findings, not merely that findings exist
• Within the journal's word limit
• No citations, undefined abbreviations or figure references
• Every claim supported in the body of the paper
• Keywords chosen separately — see choosing keywords

Quick Checklist

1. Stands aloneUnderstandable without the paper
2. Has numbersMain results stated, not just promised
3. No citationsAnd no undefined abbreviations
4. Matches the paperNothing in the abstract that is not in the text
5. Within the limitWord count as the portal specifies

Frequently Asked Questions

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