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

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 canvas