What Is an Abstract in a Research Paper? Definition + Sample

An abstract is a short paragraph, placed before the body of a research paper, that summarizes the whole paper so a reader can decide whether to read the rest. It answers four questions in order: What problem did you study and why? How did you study it? What did you find? What does the finding mean?

Three features separate an abstract from every other kind of summary. It is complete: it includes the results and conclusion, not just the setup. It is self-contained: a reader who sees only the abstract (in a database, a conference program, a search result) should understand it without the paper. And it is proportional: the space each section of the paper gets in the abstract roughly matches its weight, with method and results usually taking the most.

In a course assignment, the abstract is often the last thing a student writes and the first thing the instructor reads, which makes it a disproportionately good place to be clear. It summarizes a paper that already exists, so the method in How to Write a Research Essay: Question to Final Draft comes first and the abstract comes last. In published research it does more work still: database searches index it, and many readers never go past it.

A sample abstract, taken apart

The study below is invented for this page. The design, the numbers, and the school are fictional, but the abstract is built the way a real one would be for a short empirical paper in education or psychology.

Spelling instruction in early elementary grades relies mainly on memorization, and prior research has linked handwriting fluency to spelling accuracy without testing whether brief handwriting practice alone improves it. This study asked whether ten minutes of daily cursive-free handwriting practice raises spelling accuracy in third-grade students. Four classes at one public elementary school (N = 92) were assigned by class to a practice condition or a usual-instruction control for eight weeks; spelling accuracy was measured with a 40-word dictation test before and after the period. Students in the practice condition improved by a mean of 6.1 words (SD = 3.4), compared with 2.3 words (SD = 3.1) in the control condition, a difference that remained after adjusting for baseline scores. Gains were largest among students who scored in the lowest third at baseline. The results suggest that short, low-cost handwriting practice can support spelling in early grades, though the single-school sample and class-level assignment limit how far the finding generalizes. Replication across schools with random assignment at the student level is needed before the practice is recommended for curricula.

That is 178 words, inside the APA guideline. Here is what each sentence is doing.

Two things about the proportions. Method and results together take four of seven sentences, because they are what a reader needs to evaluate the claim. Background takes one sentence, not three; the abstract is not the place to review the literature. If you are writing the method section itself and want the fuller version of what sentence 3 compresses, How to Write a Methodology Section: A Step-by-Step Guide shows what the abstract is summarizing.

Tense also shifts on purpose: past tense for what was done and found (were assigned, improved), present tense for what the findings mean now (suggest, limit).

Structured and unstructured abstracts

The sample above is unstructured: a single paragraph with no headings. This is the default for student papers, for APA-style manuscripts, and for most journals in the humanities and social sciences.

A structured abstract covers the same content under labeled headings. Medical, nursing, and many science journals require it, and some instructors in those fields ask for it in coursework. The same study in structured form:

Background: Handwriting fluency has been linked to spelling accuracy, but the effect of brief handwriting practice alone has not been tested.
Objective: To determine whether ten minutes of daily handwriting practice improves spelling accuracy in third-grade students.
Methods: Quasi-experimental study in four classes at one public elementary school (N = 92), assigned by class to eight weeks of practice or usual instruction. Spelling accuracy was measured with a 40-word dictation test before and after the period.
Results: Mean improvement was 6.1 words (SD = 3.4) in the practice condition and 2.3 words (SD = 3.1) in the control condition, adjusting for baseline scores. Gains were largest among students in the lowest baseline third.
Conclusions: Short daily handwriting practice may support early spelling; the single-school sample and class-level assignment limit generalization, and replication with student-level randomization is needed.

The headings vary by journal: Background/Objective/Methods/Results/Conclusions is common, as is Purpose/Design/Findings/Originality in business journals. Use whatever the target requires. A structured abstract is usually allowed to be a little longer than an unstructured one because the headings themselves take words.

A third distinction sometimes appears in assignment sheets: descriptive versus informative. A descriptive abstract says what the paper is about without giving results (“This paper examines the relationship between handwriting practice and spelling”). An informative abstract, which is what both examples above are, gives the results. Almost every research assignment wants the informative kind; descriptive abstracts belong to review essays and conference proposals for work not yet done.

Word limits

These are patterns, not rules. Instructors and journals set their own limits, and the limit on the assignment sheet or the submission page overrides anything here. If no limit is given for a course paper, 150 to 250 words is a safe range: long enough for all four parts, short enough to stay a single paragraph.

Word limits are counted strictly by journals and loosely by instructors, but treating them as hard in both cases is the sensible habit. An abstract over the limit is usually over because the background is too long or the method is described twice.

Where the abstract goes and how it is formatted

In APA 7, the abstract sits on its own page immediately after the title page. The label Abstract is centered and bold at the top; the paragraph below is not indented and is double-spaced like the rest of the paper. The page carries the page number (and the running head, if a professional paper) like every other page. If keywords are required, they go on the line after the abstract, indented half an inch, with Keywords: in italics.

MLA papers usually do not include an abstract unless the instructor asks; when they do, it follows the heading block on the first page or takes its own page. Chicago-style papers and theses place it after the title page. For dissertations, the university’s formatting guide governs, and abstracts there are sometimes required to fit a single page with specific margins because they are printed in an abstracts database. How to Format a Research Paper in APA Style, Step by Step covers the surrounding page setup for the APA case.

Writing it: a four-pass method

Since the abstract is written last, the material already exists in the paper. The job is compression.

Pass 1: pull one sentence from each section. Take the sentence that best states the research question from the introduction, the sentence that names the design and sample from the method, the sentence with the main number from the results, and the first sentence of the conclusion. Paste them in order. This draft is usually too long and reads like four different people wrote it, which is fine.

Pass 2: rewrite for a stranger. The reader has not seen the paper. Replace any term defined only in the body, spell out abbreviations on first use (or drop them), and make sure the question in sentence 2 and the result in sentence 4 use the same words for the same thing. If your thesis statement is doing double duty as the research question, make sure it is specific enough to be summarized in one sentence.

Pass 3: cut to the limit. Background goes first. Then any result that does not change the conclusion. Then adjectives. Keep the numbers; a result without its number is an opinion.

Pass 4: check against the paper. Every claim in the abstract must appear in the paper, in the same strength. If the abstract says “significantly improved” and the results say “improved, though the difference did not reach significance,” the abstract is wrong. Reviewers and instructors compare these deliberately.

For a long project, the abstract is also the last check on whether the whole thing holds together; if you cannot summarize the argument in 200 words, the paper may have two arguments. How to Plan and Write a Dissertation Without Losing Your Way treats that problem at chapter scale.

Common mistakes

1. Writing an introduction instead. Background, background, “this paper will explore,” and no results. The abstract reports; it does not preview.
2. No numbers. “Students improved substantially” tells the reader nothing about size. Give the figure and the comparison.
3. Method missing. A finding without a design attached cannot be evaluated. One sentence naming sample, design, and measure is the minimum.
4. Overclaiming. “Proves,” “demonstrates conclusively,” or a recommendation the study’s limits cannot support. Match the strength of the paper’s own conclusion.
5. Citations and references. They break self-containment. Leave them in the body.
6. Undefined abbreviations. Assume the reader has not seen the paper’s abbreviation list.
7. Copying the first paragraph of the introduction. It is the most common shortcut and the most recognizable; the tense and purpose are wrong for an abstract.
8. Ending with a question or a promise. The abstract ends with what was concluded, not with what remains to be seen, unless the implication sentence is a deliberate closing.

Checklist

• States the problem or question in one or two sentences, with no literature review.
• Names the method: design, sample or materials, and the main measure or approach.
• Reports the principal result with numbers where the paper has them.
• Draws a conclusion at the strength the evidence supports and names the chief limitation.
• Every sentence can be traced to a specific section of the paper, and nothing in the abstract is absent from the paper.
• Self-contained: no citations, no undefined abbreviations, no references to tables or figures.
• Tense: past for what was done and found, present for what it means.
• Inside the word limit set by the instructor or journal; if none is given, 150 to 250 words.
• Format matches the style: in APA, own page, bold centered Abstract, no paragraph indent, optional keywords line.
• Structured or unstructured as the target requires, with the target’s own headings if structured.
• Written after the paper was finished, and reread once more against the final results section.

Frequently asked questions

Should I write the abstract before or after the paper?

After. An abstract summarizes what the paper actually says, and until the paper is finished you do not know that precisely. Some writers draft a rough abstract early as a planning tool, which is fine as long as you rewrite it at the end. A common sign of an abstract written first is a promised finding that the results section never quite delivers.

Can an abstract include citations?

Almost never. The abstract has to stand alone, and a citation points to a reference list the reader may not have. If the whole paper is a response to one specific study, you may name it in the abstract (“replicating the 2019 field trial by Halloran”), but leave out the parenthetical citation and the full reference. Check the journal or instructor guidelines, since a few disciplines permit them.

What is the difference between an abstract and an introduction?

The introduction leads the reader into the paper: it gives background, defines the problem, and ends with the research question or thesis, but it does not give away the results. The abstract summarizes the entire paper, results and conclusions included, so someone can decide whether to read it. An abstract that ends with “this paper will examine” has been written as an introduction.

Do I need keywords under the abstract?

For journal submissions, usually yes, and for APA student papers only if the instructor asks. In APA 7 the keywords line goes one double-spaced line below the abstract paragraph, indented, with the label “Keywords:” in italics followed by three to five lowercase terms separated by commas. Choose the terms someone would type into a database to find your paper, not words already in the title.