Dissertation viva questions and how to answer them
The most common dissertation viva questions, organised by chapter, with guidance on how to prepare confident, honest answers.
9 min read · Reviewed 2026 · Written and reviewed by Chris McGarrigle
Dissertation viva questions cluster around a predictable set of areas: your motivation and contribution, your methodology choices and their limitations, your findings and how confident you are in them, and what you would do differently with more time.
You cannot predict every question, but you can predict the categories, and preparing structured answers to each category will cover the great majority of what you are actually asked.
The strongest vivas are not the ones where a student defends every decision as flawless, but the ones where a student can explain their reasoning clearly and acknowledge limitations without becoming defensive.
Questions about your motivation and contribution
Examiners often open with something close to 'why did you choose this topic' or 'what does your study add that we did not already know'. Prepare a two-sentence answer for each: one on personal or academic motivation, one on the specific gap your study addresses.
- Why did you choose this topic?
- What is the original contribution of your work?
- How does your study relate to [a specific study you cited]?
- What would you tell a practitioner who read only your abstract?
Questions about your methodology
Expect to defend every major methodological choice: why this design, why this sample, why this analysis technique, and what you would do differently. The strongest preparation is rereading your own methodology chapter and asking 'why' after every sentence.
- Why did you choose this method rather than an alternative?
- How did you address [validity/reliability/trustworthiness] in your study?
- Why this sample size, and what are its limits?
- What ethical issues did you consider, and how did you resolve them?
Questions about your findings and analysis
Examiners frequently probe whether you understand your own results at a deeper level than what is written, particularly around statistical assumptions or alternative interpretations of qualitative themes. Be ready to explain a key finding without reading from your dissertation.
- Talk me through your most significant finding.
- Is there another way these results could be interpreted?
- How generalisable are your findings, and to whom?
- Did anything in your data surprise you?
Questions about limitations and future work
These questions test intellectual honesty rather than trying to catch you out. Prepare two or three genuine limitations you can discuss calmly, along with a specific (not generic) suggestion for future research that follows from them.
How to prepare in the final week
Reread your whole dissertation once, cover to cover, in one or two sittings, annotating anything you would now phrase differently. Practise saying your answers aloud, not just thinking them — vivas are a spoken format and rehearsed silent answers often collapse under the pressure of speaking.
Common mistakes
- Re-reading only the discussion and conclusion, not the whole dissertation.
- Treating every question as an attack rather than a genuine request for clarification.
- Refusing to acknowledge any limitation, which reads as a lack of critical awareness.
- Preparing answers only in your head, without practising saying them aloud.
- Forgetting your own citations well enough to discuss them without notes.
Try this: The mock-viva run-through
- Write the four category headings (motivation, methodology, findings, limitations) on separate cards.
- Under each, note two likely questions and a one-sentence answer plan, not a full script.
- Ask someone to ask you the questions out loud, in random order, and answer without notes.
- Note any answer that took longer than 90 seconds to start, and rehearse it again.
Do it in SuperDiss
Rehearse likely questions by chapter and get structured prompts for building confident, honest answers.
Practise with the Viva preparation toolStudents also ask
- What are the most common dissertation viva questions?
- Questions typically cover why you chose the topic, what your study contributes, why you chose your specific methodology, how confident you are in your findings, and what you would change with more time or resources.
- How long does a dissertation viva usually last?
- This varies by institution, but most undergraduate and master's vivas last between 20 and 45 minutes, while doctoral vivas can run for two hours or more. Check your specific programme's format in advance.
- Is it acceptable to say 'I don't know' in a viva?
- Yes, if followed by reasoning. Examiners respond far better to 'I'm not certain, but based on X I would expect Y' than to a confidently wrong guess or an obviously invented answer.
Related research: defend and submit
Rehearse the questions your examiners will ask before they ask them.
How to prepare for your viva
What examiners are testing in a viva, the questions that come up almost every time, and how to rehearse without memorising a script.
Continue your dissertation journey
- How to prepare for your viva
- How to write a discussion chapter
- How to write an abstract
- How to write a limitations section
- Master's dissertation vs undergraduate dissertation
Browse every guide in viva and completion.
Read next
How to prepare for your viva
What examiners are testing in a viva, the questions that come up almost every time, and how to rehearse without memorising a script.
How to write a discussion chapter
The difference between results and discussion, a reliable structure, and how to make claims your data can support.
How to write an abstract
A six-move formula for a dissertation abstract, with word budgets and the mistakes that make abstracts unusable.
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.