What Is an Abstract?
An abstract is a short, self-contained summary of a research paper, thesis, dissertation, or journal article. It appears at the beginning of the document, before the introduction, and gives readers enough information to decide whether to read the full paper.
Most abstracts are between 150 and 300 words, though this varies by discipline and publication. Some journals require structured abstracts with labeled sections; others require a single unbroken paragraph.
An abstract is not an introduction. An introduction sets up context, background, and motivation for a study. An abstract summarizes the entire paper, including the results and conclusions, in miniature. A reader who only reads the abstract should still understand what you studied, how you studied it, what you found, and what it means.
When Do You Need an Abstract?
Abstracts are standard in:
- Academic journal articles
- Conference papers and presentations
- Theses and dissertations
- Research reports
- Some long-form academic essays
Whether your paper needs one depends on the assignment requirements, the publication venue, and the style guide you are using. APA format requires an abstract for most student papers at the graduate level and for all journal submissions. MLA format does not typically require an abstract for student papers but does for journal submissions. Always check your instructor's or publication's specific requirements.
The Four Core Components
Most effective abstracts cover four elements, regardless of the specific structure required by a style guide or journal:
1. Purpose or Objective
State what the paper set out to do. What question did the research address? What problem did it investigate? This is typically one to two sentences and establishes the context and goal of the study.
Example: This study examined the relationship between sleep duration and academic performance in undergraduate students enrolled in STEM programs.
2. Methods
Describe how the research was conducted. What data was collected? From whom? What analytical approach was used? Keep this brief: one to three sentences for most abstracts.
Example: A survey measuring self-reported sleep hours and GPA was administered to 412 students across three universities. Data were analyzed using multiple linear regression, controlling for study hours, course load, and employment status.
3. Results
Report the main findings. What did the data show? Avoid vague language like "interesting results were found." State the actual outcome.
Example: Students averaging fewer than six hours of sleep per night had GPAs 0.4 points lower on average than those sleeping seven or more hours, even after controlling for study time.
4. Conclusions and Implications
Explain what the findings mean. Why do they matter? What do they suggest for practice, policy, or future research?
Example: These findings suggest that sleep deprivation is an underrecognized factor in academic underperformance and that university wellness programs should prioritize sleep education alongside study skills training.
Structured vs. Unstructured Abstracts
Some journals and fields require a structured abstract with explicit headings such as Background, Objective, Methods, Results, and Conclusion. Each section is labeled and typically runs two to five sentences. Structured abstracts are common in medicine, public health, and psychology.
An unstructured abstract covers the same content but in a single continuous paragraph with no headings. This format is more common in humanities, social sciences, and many general academic journals.
When writing an unstructured abstract, use the four-component framework above as your internal structure even without explicit headings. Readers and editors still expect the same information; it just flows as prose.
How to Write an Abstract: Step by Step
Step 1: Finish the Paper First
Write the abstract after the full paper is complete. You cannot accurately summarize something you have not yet written. Many writers make the mistake of writing the abstract early and then never updating it as the paper evolves. The abstract must reflect the final version of the paper.
Step 2: Identify the Key Points from Each Section
Go through each major section of your paper and pull out one to two sentences that capture the essential point:
- From the introduction: the main research question or objective
- From the methods section: the study design and main procedures
- From the results section: the primary finding or findings
- From the discussion or conclusion: the main interpretation and implication
Step 3: Draft a Single Paragraph
Combine the key points into a coherent paragraph. Write it in the same tense your paper uses for each section: present tense for general facts and conclusions, past tense for completed methods and results in empirical work. Avoid copying sentences directly from the paper; paraphrase instead.
Step 4: Cut to the Word Limit
Most abstracts must fit within 150 to 300 words. After drafting, check the word count and trim ruthlessly. Cut filler phrases, eliminate redundancy, and replace wordy constructions with direct ones:
- "It was found that participants showed…" becomes "Participants showed…"
- "The purpose of this study is to investigate…" becomes "This study investigates…"
- "Due to the fact that…" becomes "Because…"
If you are having trouble cutting, Rephrasely's summarizer or paraphraser can help you condense sentences without losing the essential meaning.
Step 5: Check Against the Paper
Read the abstract alongside the paper's introduction, results, and conclusion. Every claim in the abstract must appear in the paper. Do not include findings in the abstract that are not reported in the paper, and do not omit the paper's central finding from the abstract.
Abstract Writing for Different Disciplines
Sciences and Social Sciences
Empirical research abstracts follow the four-component structure closely. Results are specific and quantified where possible. Past tense is used for methods and results; present tense for conclusions and general claims.
Humanities and Literary Studies
Humanities abstracts often lead with an argument or interpretation rather than a research question. They may be slightly less formulaic but still cover purpose, approach, and conclusion. Because humanities papers often do not have discrete methods and results sections, the abstract reflects the argumentative structure of the paper rather than the empirical structure.
Conference Submissions
Conference abstracts are often submitted before the research is complete, so they sometimes describe intended methods and expected contributions. In this case, use future tense where appropriate and be specific about what will be presented.
Keywords
Many journals and style guides (including APA 7th edition) require a list of keywords below the abstract. Keywords help readers find your paper in database searches. Choose three to five terms that represent the core topics, methods, or populations of the study. Use specific terms rather than broad ones, and match the vocabulary used in your field's major journals and databases.
Common Abstract Mistakes
- Omitting results: Many student abstracts describe the study without reporting what was found. An abstract without results is incomplete.
- Being vague: "Results were significant" or "important conclusions were drawn" tells the reader nothing. State the actual finding.
- Including information not in the paper: The abstract must match the paper exactly. Any claim in the abstract must be supported in the body.
- Citing sources: Abstracts should not include citations. All referenced work belongs in the paper itself.
- Defining terms: Do not use the abstract to define terminology. The abstract assumes a reader familiar with the field.
- Using first-person excessively: While "we investigated" is acceptable in many fields, excessive "I" or "we" can eat into word count and shift focus from the work to the researcher.
Abstract vs. Executive Summary
An abstract and an executive summary are both condensed versions of a longer document, but they serve different audiences and purposes. An abstract is for academic readers who need to evaluate whether a paper is relevant to their research. An executive summary is for business or policy audiences who need to make decisions based on the document's recommendations. Executive summaries are longer (often one to two pages), may include subheadings, and typically emphasize recommendations over methodology. For academic writing, use an abstract; for professional reports, use an executive summary.
For a full walkthrough of academic paper structure, see the guide on how to write a research paper.
Frequently Asked Questions
Should the abstract be written in past or present tense?
It depends on the section being described. Methods and results are typically in past tense because they describe completed actions: Participants completed a survey. Background context and general claims use present tense: Sleep deprivation affects cognitive performance. Conclusions are often in present tense as well: These findings suggest that... Follow the conventions of your discipline and style guide.
Can I copy sentences from my paper into the abstract?
Technically you can, but it is better practice to paraphrase. Word-for-word copying of sentences can trigger self-plagiarism flags in some plagiarism checkers, and it misses the opportunity to tighten the language for the abstract's shorter format. Summarizing forces you to distill the idea to its essence, which produces a stronger abstract.
How is an abstract different from an introduction?
An introduction provides background, context, and motivation before presenting the research question. It does not reveal the results or conclusions. An abstract covers the entire paper in miniature, including the outcomes. A reader who only reads the abstract knows the results. A reader who only reads the introduction does not.
What if my paper does not have distinct methods and results sections?
Humanities and argumentative essays often lack explicit methods and results. In this case, describe your approach (close reading, archival research, theoretical analysis) and your central argument or finding in place of methods and results. The abstract still needs to communicate what you did and what you concluded.
How do I write an abstract for a paper I have not finished yet?
For conference submissions, write a prospective abstract that describes what you intend to do and argue. Use future or present tense: This paper will examine... / This paper examines... Be specific about the expected contribution. After you complete the paper, revise the abstract to match the actual content.