How to choose a dissertation topic
A practical method for choosing a dissertation topic you can actually research: start from curiosity, test feasibility, and narrow until the topic is doable.
8 min read · Reviewed 2026 · Written and reviewed by Chris McGarrigle
Most students choose a topic the wrong way round. They start with a subject area that sounds impressive, then spend six weeks discovering there is no accessible data, no clear argument and no way to finish it in the time they have.
A better approach is to start from a genuine curiosity, then squeeze it through three filters — interest, feasibility and contribution — until what is left is small enough to research properly and interesting enough to keep you going.
Start from curiosity, not from a topic list
Write down the questions you already find yourself asking: about your workplace, your course, your community, something you read that annoyed you. These are better raw material than a departmental topic list because you already have context and motivation.
At this stage do not judge the ideas. Capture ten. Most will be unusable, but two or three will contain something worth developing.
Turn the curiosity into a researchable problem
A curiosity becomes researchable when you can name who is affected, what is unclear, and what evidence would change your mind. 'Social media and mental health' is not researchable. 'How final-year nursing students describe the effect of shift-pattern group chats on their sleep' is.
- Population: who exactly are you studying?
- Phenomenon: what specific behaviour, decision or outcome?
- Context: which setting, sector or country?
- Timeframe: is this current practice, or a defined period?
Test feasibility before you commit
Feasibility is where most dissertations quietly fail. Before committing, check that you can reach participants or data within your timetable, that your ethics application is realistic, and that enough published literature exists to build a review on.
If the honest answer to any of those is no, you do not have a topic yet — you have an ambition. Narrow the context rather than abandoning the interest.
Check there is something to contribute
You are not expected to revolutionise your field at undergraduate or master's level. You are expected to say something that is not already obvious from the literature: a new context, a new population, a contradiction nobody has tested, or a method applied where it has not been applied before.
Common mistakes
- Choosing a topic because it sounds impressive rather than because you can research it.
- Picking a scope that would take three years and a research team.
- Assuming you will get access to a hard-to-reach population without checking first.
- Confusing a subject area with a research problem.
Try this: The ten-then-three exercise
- Set a timer for ten minutes and list ten things you are genuinely curious about.
- Cross out any where you cannot name a population and a context.
- For the three strongest, write one sentence on how you would collect evidence.
- Rank them by feasibility, not by how impressive they sound.
Do it in SuperDiss
Capture your curiosity and let the supervisor question it into a researchable problem.
Open The Big Idea canvasStudents also ask
- How do I choose a dissertation topic?
- Start from a genuine curiosity rather than a topic list, then filter it through three tests: does it interest you enough to sustain months of work, can you realistically reach the data or participants in your timeframe, and does it add something to an existing conversation? Narrow the population, context and timeframe until the topic is small enough to finish.
- What makes a dissertation topic too broad?
- A topic is too broad when you cannot name who is affected, in what setting, over what period. 'Social media and mental health' is too broad; 'how final-year nursing students describe the effect of shift-pattern group chats on their sleep' is researchable.
- How long should it take to settle on a topic?
- Most students need two to three weeks of reading and testing. Spending longer usually means the feasibility check has been skipped — check data access and ethics early rather than after committing.
Related research: plan and question
Turn the topic into a defensible research question, aims, objectives and a proposal.
How to write a research question
What separates a strong dissertation research question from a weak one, with tests you can run on your own question before you commit to it.
Research aims and objectives: what they are and how to write them
The difference between a research aim and research objectives, with a method for writing objectives that are specific, achievable and assessable.
How to write a dissertation proposal
What a dissertation proposal must contain, how long each section should be, and how supervisors decide whether to approve it.
Building a realistic dissertation timeline
How to plan a dissertation timeline backwards from your deadline, with realistic time allocations for each stage and buffer for setbacks.
Continue your dissertation journey
- How to write a research question
- What is a research gap?
- How to write a dissertation proposal
- Building a realistic dissertation timeline
- Research aims and objectives: what they are and how to write them
Browse every guide in dissertation planning.
Read next
How to write a research question
What separates a strong dissertation research question from a weak one, with tests you can run on your own question before you commit to it.
What is a research gap?
Research gaps explained in plain English: the main types of gap, how to find one in your reading, and how to write a gap statement you can defend.
This guide is general educational content. Your institution's regulations, handbook and supervisor's instructions always take precedence. Where a named framework is mentioned, consult the original source text rather than relying on this summary.