A thesis abstract is a short, accurate statement of the whole thesis that summarises the aim, the methods used, the main results and the conclusion. It usually appears in the language of the thesis and, where the institution requires it, in a second language, and it is followed by a list of keywords. Although it sits at the very front of the thesis, just after the title page, you write it only once the full text is finished. This article explains exactly what an abstract should contain, how it differs from a short annotation, how many keywords to include and which mistakes to avoid.
Abstract versus annotation: what is the difference
In English-speaking academia the standard term for the summary at the front of a thesis is the abstract, and that is what almost every department asks for. The word annotation usually means something narrower: a short descriptive note about a source, as in an annotated bibliography, rather than a full summary of your own work. It helps to keep the two ideas apart even if your faculty handbook happens to use them loosely.
The practical distinction is between an informative summary and a brief descriptive note. An abstract is informative: it states what the work does and what it found, including results and conclusions. A short annotation or descriptive note is indicative: it signals what a piece is about without necessarily revealing the findings.
A simple comparison helps:
| Feature | Abstract | Short annotation |
|---|---|---|
| Purpose | informs about content and results | indicates what the work is about |
| Content | aim, methods, results, conclusion | topic and focus |
| Length | usually around 100 to 250 words | usually shorter, a few sentences |
| Typically found in | theses and research papers | bibliographies, catalogues, databases |
A good control question for your own text: if you are evaluating or commenting, that is not an abstract but an introduction or a discussion. An abstract is a condensed, accurate statement of content, with no added interpretation or criticism.
What a thesis abstract should contain
A good abstract is a miniature of the whole thesis. In a small space it answers four questions: what you studied, how you studied it, what you found and what it means. These four elements form its backbone.
Aim of the thesis
Right at the start of the abstract, state what the thesis set out to do and what problem it addresses. Phrase it concretely, ideally with the same verb you use for the aim in your introduction (to determine, analyse, compare, design, verify). The reader then knows immediately where the work is heading.
Methods used
In one or two sentences, indicate how you reached your results: whether you used a questionnaire, interviews, document analysis, an experiment or a mix of approaches. Detail belongs in the methodology chapter; a brief mention is enough in the abstract.
Main results
This is the part students most often underplay. An abstract should not merely announce that you "reached conclusions" but state which ones. Pick the one or two most important findings and name them specifically. Results are exactly what set a full abstract apart from a mere descriptive note.
Conclusion and contribution
At the end, briefly state what follows from the results and what the work contributes, including a recommendation for practice where relevant. Do not add new information that is not in the thesis, and do not include citations or references to the literature. The abstract should be understandable on its own, without the rest of the text.
Keywords: how many to give and how to choose them
Below the abstract you list keywords that capture the substantive content of the thesis. They support cataloguing and searching in databases and repositories, so the right keywords help someone who is looking for exactly your topic find your work.
The recommended number is usually three to five keywords, though some departments allow more. Always follow your own department's guidance, which takes priority over general advice.
A few simple rules help when choosing keywords:
- Pick terms that are genuinely dominant in the work, not marginal ones.
- Use terms someone would actually type into a search engine when looking for your topic.
- Prefer established subject terms over your own coinages.
- Avoid very general words (for example "analysis" or "research") that specify nothing.
- You can use single-word and multi-word terms; separate them with commas.
Keywords appear in the language of the thesis and, where a second-language abstract is required, in that language too. Make sure you choose the correct subject terms in translation rather than the first result from a machine translator.
How long an abstract should be
An abstract is a short form. A common recommendation is roughly 100 to 250 words, though some departments allow a longer text. The key point is to fit all four elements (aim, methods, results, conclusion) into that space without anything essential going missing.
Check the exact limit in your own institution's guidelines, because requirements differ. Some set a specific word count, others only recommend "brevity". More important than the precise number is that the abstract covers the aim, methods, results and conclusion in full.
The abstract is also not counted towards the prescribed length of the body of the thesis. The length of a thesis is usually measured from the introduction to the conclusion, so the title page, abstract, table of contents and reference list do not count towards it. You can read more about how length is calculated in the article on thesis length and word count.
Structured versus unstructured abstract
An abstract can take two forms. For theses, the unstructured abstract is most common: it is written as one continuous paragraph with no headings. Aim, methods, results and conclusion follow one another as sentences, not as separate bullet points.
A structured abstract, by contrast, mirrors the basic divisions of the work and names each part explicitly, for example "Aim:", "Methods:", "Results:", "Conclusion:". This format is common above all in the natural and medical sciences and in academic journals.
Which form to choose is set by the convention of your field and the requirements of your department. Unless your guidelines say otherwise, the safest choice for a bachelor's or master's thesis is an unstructured abstract written as one continuous paragraph.
Second-language abstract and summary
Many institutions require an abstract in the language of the thesis and in a second language, most often English, and some also ask for a longer summary. The second-language version should match the original in content, not be a loose paraphrase. You write the same text, only in another language, including the translation of the keywords.
The term summary is sometimes used as a synonym for the second-language abstract, and sometimes departments require it as a separate, somewhat longer overview of the work. These are two slightly different requirements, so check what your institution actually asks for: a short second-language abstract, or a more extensive summary as well.
When translating into English, watch the subject terminology and the grammar. Unchecked machine translation tends to introduce errors that an examiner spots easily. If you are unsure in the second language, it pays to have the abstract checked.
When to write the abstract: always last
Although the abstract sits almost at the front of the thesis, you should write it only once the whole text is finished. The reason is simple: only after the work is complete do you know exactly which aim you actually met, what results you obtained and what the final structure looks like.
If you write the abstract too early, it risks promising something other than what the thesis ends up containing. The most practical approach is the same as with the thesis introduction: you can sketch a working version as you go, but finalise the wording as one of the last things before submission.
A useful trick is to write the abstract from the finished introduction and conclusion. The introduction gives you the aim and methods; the conclusion gives you the results and contribution. From these two parts you can assemble the abstract quickly and faithfully.
A template for the abstract
Treat the following backbone as a template to adapt to your topic, not as text to copy. Every thesis goes through an originality check, so borrowed phrasing is a poor idea.
- Aim (1 to 2 sentences): "This thesis aims to [determine/analyse/design] [the object of study] in [context/sample]."
- Methods (1 sentence): "To achieve this aim, we used [method of data collection and analysis]."
- Results (1 to 2 sentences): "The analysis showed that [main finding]."
- Conclusion and contribution (1 sentence): "The thesis offers [a recommendation or contribution to practice or further research]."
Below this text you then add a line of keywords, and you repeat both the abstract and the keywords in the second-language version. The result should be one continuous, self-contained paragraph.
Common mistakes in abstracts
Missing results. The most common mistake. The abstract describes the aim and methods but never says what the work actually found. Without results it is a descriptive note, not an abstract.
An abstract written too early. If you write it at the start and never revisit it after finishing the thesis, it often promises something the text does not ultimately deliver.
Citations and references in the abstract. The abstract should be self-contained. References to the literature, to tables or to chapters do not belong in it.
New information that is not in the thesis. The abstract only summarises existing content. Nothing new should appear there for the first time.
A weak second-language abstract. A literal machine translation with errors in terms and grammar looks careless, and an examiner detects it easily.
Unsuitable keywords. Words that are too general, or conversely marginal terms that do not capture the content. Keywords should make the work findable, not merely describe it.
How the abstract fits the whole thesis
The abstract is not an isolated formality but a mirror of the whole thesis. The aim in it should match the aim in the introduction, the methods should match the methodology chapter and the results should match the conclusion. If these parts diverge, it is a signal that something in the work does not hold together.
A good check before submission is to read the abstract, introduction and conclusion side by side. They should tell the same story: the introduction promises, the work delivers, and the abstract and conclusion both state the result. For how the individual chapters connect, see the article on how to structure a thesis.
If you are unsure about the abstract, the keywords or the second-language version, our writers can help you phrase the summary so that it matches the content of the thesis exactly. You can look at our services or go straight to placing a no-obligation order, and we will advise you on what your work specifically needs.
Frequently asked questions
What is the difference between an abstract and an annotation?
An abstract is an informative summary that also states the results and conclusion of the work. An annotation, in the English sense, is usually a short descriptive note about a source, as in an annotated bibliography. For the summary at the front of a thesis, almost every department asks for an abstract, but follow your own faculty's guidance if its wording differs.
How many keywords should I give?
Usually three to five keywords, though some departments allow more. Pick terms that are dominant in the work and that someone would type into a search engine when looking for your topic. You will find the binding number in your department's guidelines.
How long should an abstract be?
A common recommendation is roughly 100 to 250 words, though some institutions allow a longer text. More important than the exact number is that it covers the aim, methods, results and conclusion. Check the precise limit in your own faculty guidelines.
When should I write the abstract?
Only after the whole thesis is finished, even though it sits almost at the front of the document. Only then do you know exactly which aim you met and what results you obtained. You can sketch a working version as you go, but finalise the wording just before submission.
Does the abstract need a second-language version?
Often, yes. Many institutions require an abstract in the language of the thesis and in a second language, most often English. The second-language version should match the original in content, including the translation of the keywords. Watch the subject terminology and the grammar.
Do citations and references belong in the abstract?
No. The abstract should be self-contained, without the rest of the thesis, so citations, references to sources, tables and chapter references do not belong in it. Those elements belong in the main text, not in the summary.