The abstract is often the last thing students write and the first thing markers read — which makes it one of the highest-leverage 250 words in your entire dissertation. A weak abstract sets low expectations before your marker has read a single chapter. A strong one does the opposite. Here’s how to actually write one that works.
Write it last, even though it comes first
This trips up more students than it should. An abstract summarises what you actually did and found — not what you planned to do. Writing it before your dissertation is finished almost always means rewriting it later anyway, once your findings and conclusions have taken their final shape. Leave it until everything else is settled.
Cover five things, in order
Most strong abstracts follow a consistent structure, usually in one to two sentences each: the context or problem your research addresses, your specific research question or aim, your methodology in brief, your key findings, and what those findings mean or contribute. Skipping any one of these five is the most common reason abstracts feel incomplete — usually it’s the “what this means” part that gets cut for space, which is unfortunate, because it’s often the part markers care about most.
Cut anything that isn’t in the dissertation itself
An abstract isn’t the place for background reading or context that doesn’t appear in your introduction. Every claim in your abstract should be traceable to something actually argued or found in the body of your dissertation. If a sentence in your abstract couldn’t be supported by pointing to a specific page, cut it.
Be specific about findings — vague summaries waste the space
“This study found several interesting results relating to X” tells a marker nothing. “This study found that X significantly increased Y, while Z showed no measurable effect” tells them exactly what your research contributes. Word count in an abstract is scarce — every vague sentence is a specific one you didn’t have room for.
Match your word count exactly
Most UK dissertation abstracts have a strict word limit, typically 200–300 words depending on your institution. Going over signals you couldn’t distil your own research — going significantly under signals you’re missing content. Treat the limit as a target to hit closely, not a ceiling to stay safely under.
Read it as if you know nothing about your topic
By the time you write your abstract, you’ve spent months inside your own research — jargon and assumptions that feel obvious to you may not be obvious to a marker encountering your topic for the first time in 250 words. Ask someone outside your subject area to read your abstract and tell you, in their own words, what your dissertation is about. If they can’t, the abstract needs work before the dissertation goes anywhere near submission.