If a reader saw only your thesis abstract, could they state your research question, your method and your main finding? For most readers the abstract is the whole thesis: examiners read it first and form expectations, repository users decide from it whether to download, and admissions tutors may read nothing else. Yet it is often written in the last hour before submission as a compressed introduction that reports no results. This guide sets out what an abstract must contain, how long universities and APA allow it to be, when a structured format is better than a single paragraph, and how to write one in five steps, with a full example.
This article is part of our guide How to Write a Master’s Thesis by the Mastermind PhD team and relates to our Academic Proofreading & Review service. Sources last checked: November 2026.
What is a thesis abstract? A thesis abstract is a self-contained summary of 150 to 350 words, placed after the title page, that states the problem and aim, the design and sample, the main results with key figures, and the conclusion or implications. It contains no citations, undefined abbreviations or information absent from the thesis, and it is written after the thesis is complete.
What must a thesis abstract contain?
A complete thesis abstract makes five moves, usually in one or two sentences each:
- Background and problem: the issue and why it matters, leading to the gap.
- Aim: what the study set out to do, in the terms of the research questions.
- Method: the design, the sample (who and how many), the instruments or data and the analysis.
- Results: the main findings with key numbers (direction, size, significance) or main themes.
- Conclusion and implications: what the findings mean and for whom, plus the main limitation if space allows.
The APA Abstract and Keywords Guide lists the same elements (problem or research questions, hypotheses, methods including design, sample and sample size, results, implications) with one to two sentences per topic. The most common failure is an abstract that performs moves 1 to 3 and stops, because it was drafted from the proposal.
How long should a thesis abstract be?
The limit comes from your regulations and varies more than students expect.
| Source (checked October 2026) | Limit or guidance | Scope |
|---|---|---|
| APA Abstract and Keywords Guide (7th ed.) | Limit to 250 words unless the instructor or journal requires otherwise | Papers and manuscripts in APA style |
| University of Aberdeen, Regulations for Postgraduate Study | A separate abstract “not exceeding 300 words”, plus a summary of salient points within the thesis | Research degree theses |
| Oxford Brookes University, research degrees handbook | “An abstract of approximately 300 words” stating the nature, scope and contribution of the work | MPhil and PhD theses |
| Cornell University Graduate School | Usually no more than 350 words for a doctoral dissertation and 600 words for a master’s thesis | US theses and dissertations |
| University of Texas at Dallas formatting guide | Doctoral and master’s abstracts should not exceed 500 words | US theses and dissertations |
If your handbook gives no figure, 250 to 300 words is safe; a single page is the absolute ceiling.
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Structured or unstructured: which format should you use?
An unstructured abstract is a single paragraph in which the five moves follow one another without headings. A structured abstract uses labelled sections (Background, Aim, Methods, Results, Conclusions). James Hartley’s research on structured abstracts found that readers judge them clearer and more informative and that they are easier to search, which is why medical and health journals require them.
| Feature | Unstructured abstract | Structured abstract |
|---|---|---|
| Appearance | One paragraph, no headings | Four to six labelled sections |
| Where expected | Most thesis regulations, APA-style manuscripts, humanities and social science journals | Medicine, nursing, public health, some business and information science journals |
| Strengths | Reads as prose; fits any discipline; accepted everywhere | Nothing is forgotten; results are easy to locate |
| Risks | Easy to skip the results | Can read as a form; some regulations do not permit headings |
Use the format your regulations prescribe; where they are silent, write the unstructured version and keep a structured version for journal submission, since only the headings change.
How do you write a thesis abstract in five steps?
- Collect the sentences from the thesis. Take the aim from chapter 1, the design and sample sentence from chapter 3, the key result for each research question from chapter 4 and the main conclusion from chapter 5.
- Cut to one or two sentences per move. Remove citations, examples and any statistic that is not the headline figure.
- Make the results concrete. Replace “significant relationships were found” with direction, size and significance: “onboarding structure was negatively associated with turnover intention (r = -.42, p < .001)”.
- Check the match with the title and the research questions. The variables and population in the title must appear in the abstract, and every question from chapter 1 must have an answer in move 4.
- Count, then read aloud. Trim to the limit, confirm past tense for what was done and present tense for what the findings mean, and define or remove every abbreviation.
A full example abstract
The thesis abstract below describes a fictional study written for this guide; the figures are invented. It is shown in two parts here for easier reading; in the thesis it would be a single paragraph.
Early turnover among junior software developers is costly for fast-growing technology firms, and onboarding is frequently blamed, yet most evidence comes from large organizations with on-site programs. This study examined whether the structure of remote onboarding is associated with turnover intention among junior developers in Dutch scale-ups, and whether perceived supervisor support moderates that association. A cross-sectional online survey was completed by 212 developers with less than two years’ tenure at 38 scale-ups, using validated scales for onboarding structure, perceived supervisor support and turnover intention. Data were analyzed with descriptive statistics, Pearson correlations and moderated multiple regression.
Turnover intention was moderate (M = 2.8 on a 5-point scale, SD = 0.9). Onboarding structure was negatively associated with turnover intention (r = -.42, p < .001) and remained a significant predictor after controlling for tenure and company size (β = -.38, p < .001); the model explained 31% of the variance. Perceived supervisor support moderated the association: the protective relationship of structured onboarding was weaker when support was high. The findings suggest that structured onboarding matters most where supervisor support is limited, and that scale-ups can reduce early turnover risk by formalizing remote onboarding rather than relying on individual managers. Limitations include the cross-sectional design and self-reported measures.
Keywords: onboarding, turnover intention, supervisor support, remote work, software developers
The same thesis abstract in structured form
Background: Early turnover among junior developers is costly, and evidence on onboarding comes mainly from large on-site organizations. Aim: To test whether structured remote onboarding is associated with turnover intention in Dutch scale-ups and whether supervisor support moderates the association. Methods: Cross-sectional survey of 212 junior developers at 38 scale-ups; validated scales; correlation and moderated regression. Results: Onboarding structure was negatively associated with turnover intention (r = -.42, p < .001; β = -.38 after controls; 31% of variance explained); the association was weaker where supervisor support was high. Conclusions: Formalizing remote onboarding is most valuable where supervisor support is limited; the cross-sectional design limits causal inference.
The structured version is shorter because the headings replace the transitions; the content, figures and claims are identical.
How do you choose keywords?
The APA guide asks for three to five keywords, phrases or acronyms covering the topic, population, method and application of results, in lowercase (except proper nouns), separated by commas, with no final period. Choose terms a searcher in your field would type: the main variables, the population and the setting, using the controlled vocabulary of your discipline’s databases where one exists. Where the repository indexes the title separately, add synonyms rather than repeating title words.
What should you avoid in a thesis abstract?
- Citations; the abstract stands alone.
- Abbreviations not defined on first use.
- The future tense or proposal language (“this study will investigate”, “it is hoped”).
- Background that takes half the words and results that take one sentence.
- Vague results (“significant findings emerged”) instead of direction, size and significance.
- Claims stronger than the design allows (“proves”, “causes” in a correlational study) or absent from the thesis.
- Promotional adjectives (“groundbreaking”, “novel”) in place of specifics.
Abstract, summary and introduction: what is the difference?
Some regulations require more than one of these. The University of Aberdeen’s postgraduate regulations ask for both a summary of the thesis’s salient points inside the document and a separate abstract of no more than 300 words. A lay summary, where required, explains the study to a non-specialist in everyday language and does not replace the abstract. The introduction sets up the problem and the questions but does not report results; an abstract that reads like an introduction has failed. An executive summary (common in MBA theses) is longer, may use headings and bullet points, and emphasizes recommendations.
Final checklist
- All five moves are present, with results stated in numbers or themes.
- It is within the limit set by your regulations, and the keywords follow the required format.
- Every variable and population in the title appears, and every research question has an answer.
- No citations, undefined abbreviations, future tense or claims absent from the thesis.
- Past tense for what was done; present tense for what the findings mean.
- Someone who has not read the thesis could state the question, method and main finding after reading it.
A proofreader or academic reviewer can check the thesis abstract for clarity, tense, grammar and consistency with the thesis; the claims and figures are yours and must match the chapters exactly.
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Frequently asked questions
Should the abstract include citations?
No. The abstract stands alone and is often displayed without the thesis, so references cannot be resolved. A named theory can be mentioned without a citation.
Should the abstract include statistics?
Yes, the headline figures: the sample size and the direction, size and significance of the main results (for example, r = -.42, p < .001); one or two figures per research question is enough.
When should I write the thesis abstract?
Last, after the discussion and conclusion are final, because it must report what the thesis actually found. An early draft written as a planning tool must be rewritten, not merely trimmed, at the end.
Can the abstract have more than one paragraph?
Most regulations and APA style expect a single paragraph unless a structured format with headings is permitted or required. Where the handbook is silent, use one paragraph in the thesis and keep a structured version for journal submissions.
Does the abstract count toward the thesis word limit?
In many regulations it does not, along with the reference list and appendices, but practice varies by university and department. Confirm the exclusions in your handbook rather than assuming.
Sources
- American Psychological Association. Abstract and Keywords Guide, APA Style 7th Edition. https://apastyle.apa.org/instructional-aids/abstract-keywords-guide.pdf (accessed October 2026)
- American Psychological Association. (2020). Publication Manual of the American Psychological Association (7th ed.). https://apastyle.apa.org/
- Hartley, J. (2004). Current findings from research on structured abstracts. Journal of the Medical Library Association, 92(3), 368–371.
- University of Aberdeen. Regulations for Postgraduate Study: Regulations for the Preparation and Submission of Postgraduate Theses for Research Degrees. https://www.abdn.ac.uk/uploads/registry/calendar/documents/PostgraduateSupplementaryRegs.pdf (accessed October 2026)
- Oxford Brookes University. Research Degrees Policy and Procedure Handbook, section 19: Format of the thesis. https://brookes.ac.uk/students/research-degrees-team/current-students/regulations/research-degrees-handbook/format-of-the-thesis (accessed October 2026)
- Cornell University Graduate School. Required Sections, Guidelines, and Suggestions (thesis and dissertation). https://gradschool.cornell.edu/academic-progress/thesis-dissertation/writing-your-thesis-dissertation/required-sections-guidelines-and-suggestions/ (accessed October 2026)
- Swales, J. M., & Feak, C. B. (2012). Academic Writing for Graduate Students: Essential Tasks and Skills (3rd ed.). University of Michigan Press.
Sources last checked: November 2026. This article is general educational guidance and does not replace your university regulations or your supervisor’s instructions. How we prepare our content.