How to Write an Abstract for a Research Paper (With Examples)

The abstract is the most widely read part of any research paper, and often the only part. Editors, reviewers, and busy researchers scan it first to decide whether the full study is worth their time. It is also what appears in databases and search results, so a clear abstract is how the right readers find your work at all.

An abstract is a short, standalone summary of an entire paper, usually 150 to 250 words, that lets a reader decide whether to read on. The good news is that a strong abstract follows a predictable shape. Once you know the moves it makes and the conventions it follows, you can write one in a single focused sitting. This guide walks through both, with a labelled example you can model.

What an abstract is, and where it appears

An abstract condenses the whole paper into one paragraph: the question, what you did, what you found, and what it means. The key word is standalone. A reader should understand it without opening the paper, which means no references to your figures, no citation numbers, and no phrases like “see section 3.” It sits at the top of the paper, but it describes the finished work as a whole.

• Under the title of the paper, before the introduction.
• In academic databases and indexes, often shown on its own with the title and keywords.
• In conference and journal submission systems, sometimes required before the full paper.
• In grant reports, theses, and dissertations, where it may be called a summary.

Descriptive versus informative abstracts

There are two common types, and picking the right one matters. A descriptive abstract states what the paper covers, its topic, purpose, and scope, without revealing the results. It is short, roughly 50 to 100 words, and more common in the humanities. An informative abstract does more: it summarizes the whole study, including the actual results and conclusions. It runs about 150 to 250 words and is standard in the sciences and most journals. When nothing specifies, write an informative abstract.

• Descriptive: topic and aim only, no results, around 50 to 100 words.
• Informative: full summary with methods, results, and conclusions, around 150 to 250 words.
• If in doubt, or if your study reports data, choose informative.

The four moves of an informative abstract

An informative abstract is a compressed version of the paper’s IMRaD structure (introduction, methods, results, and discussion). Think of it as four moves, each one or two sentences long.

• Background and purpose: why the topic matters and the specific question or aim of the study.
• Methods: what you actually did, including the design, the participants or data, and the main procedure or measure.
• Results: the key finding stated plainly, with the actual numbers if they carry the point.
• Conclusion and implications: what the finding means and why it matters to the field or to practice.

The move students most often weaken is results. Report the finding, do not just promise it. Write “scores rose by 18 percent,” not “this paper discusses the effect on scores.” Concrete numbers show that a real study happened.

A worked example you can model

Here is a model informative abstract for an invented study. It is illustrative only: the study, sample, and numbers are fictional, included to show the structure, not to report a real result.

Below such an abstract, you would add keywords, for example: sleep restriction, napping, short-term memory, undergraduates, recall.

Length, tense, and keywords

A few conventions apply across most fields, though your journal or assignment brief always wins if it says otherwise.

• Length: usually 150 to 250 words for an informative abstract. Conference briefs often cap it, so check the exact limit.
• Tense: use past tense for what you did and found (we measured, recall was higher). Use present tense for background facts and for what the results mean.
• Person and voice: many fields now accept we and active verbs. Follow your style guide if it asks for a specific voice.
• Keywords: list 3 to 6 terms a searcher would actually type. Favour words not already in your title, so the pair covers more ground.

What to cut, and why to write it last

Most weak abstracts are too vague, not too short. Cut anything that does not help a reader judge the study.

• No citations or reference numbers. The abstract stands alone.
• No new information that is not in the paper itself.
• No figures, tables, or images, and no references to them.
• No undefined abbreviations, and as little jargon as the topic allows.
• No empty openers like “this paper aims to explore.” Start with the real point.

Finally, write the abstract last. You cannot summarize a paper you have not finished, and a first draft rarely matches the paper you end up with. Once the study is written, pull one sentence from each section, stitch them into a paragraph, add your key number, and trim to the word limit. Then read it alone, away from the paper, to be sure it stands up.

An abstract is small, but it carries the weight of the whole paper. Hit the four moves, state your real finding, keep it standalone, and write it once the work is done. Do that well, and the right readers will find your study and see why it matters.