Dissertation Defense and Viva Questions: 40 Common Questions with Sample Answers
Whether you call it a dissertation defense, a thesis defense or a viva voce, the oral examination is the moment when you explain and justify your research face to face. Most of the questions examiners ask are predictable. If you prepare answers to the common ones, you will walk into the room with far more confidence.
This guide lists 40 common dissertation defense and viva questions, grouped by topic, with sample answers for the most important ones. For an overview of the whole process, including what happens on the day and how to prepare, see our guide to the PhD dissertation defense.
Defense vs Viva: Is There a Difference?
The terms describe the same basic idea: an oral examination of your research. In the UK the term viva (short for viva voce, “by live voice”) is most common. A UK PhD viva is usually held in private with an internal and an external examiner. In the US and some other countries, the term defense is more common, and it may involve a committee and sometimes an audience. Some master’s and undergraduate programmes also hold short vivas or oral presentations. Always check your university’s regulations, because formats vary.
How to Structure Your Answers
A simple structure keeps your answers clear and focused:
- Answer the question directly in the first sentence.
- Explain your reasoning, referring to your literature, data or method.
- Give an example from your dissertation, such as a finding, a chapter or a participant quote.
- Link back to your research aim or contribution.
Keep most answers to one or two minutes. If the examiners want more detail, they will ask a follow-up question.
Opening Questions (1 to 6)
Examiners often start with broad questions to settle you in and see how well you can summarise your work.
- Can you summarise your thesis in a few minutes?
- Why did you choose this topic?
- What is the main research problem you set out to address?
- What are your research aims and objectives?
- What is your main contribution to knowledge?
- Who would benefit from your research?
Sample answer: “Can you summarise your thesis?”
“My thesis examines why small UK retailers adopt, or fail to adopt, online sales channels. Existing studies focus mainly on large firms, so there is limited evidence on how small retailers make these decisions. I used semi-structured interviews with owners of small retail businesses and analysed the data thematically. The main finding is that owners’ confidence with technology mattered more than cost. My contribution is a clearer understanding of the barriers small retailers face, and practical recommendations for support programmes.”
Notice how the answer covers the problem, the gap, the method, the main finding and the contribution in a few sentences. Practise your own version until you can deliver it naturally. Our guide to dissertation aims and objectives can help you state your aims clearly.
Literature Review Questions (7 to 12)
- Which authors or studies influenced your work the most?
- What gap in the literature does your research address?
- Why did you include, or leave out, particular studies?
- How does your work relate to the main debates in your field?
- What theoretical framework did you use, and why?
- Has anything important been published since you completed your literature review?
Sample answer: “Why did you choose this theoretical framework?”
“I used the Technology Acceptance Model because my research question focused on why individuals decide to use a new technology. The model’s two core concepts, perceived usefulness and perceived ease of use, matched the factors that previous studies identified as important. I considered Diffusion of Innovations theory, but it focuses more on how innovations spread across a population, which was less relevant to individual decisions.”
If you are unsure how to explain your theory, our theoretical framework examples show how to justify a theory against alternatives.
Methodology Questions (13 to 22)
Methodology questions are usually the most detailed part of a defense. Examiners want to see that every choice was deliberate.
- Why did you choose a qualitative, quantitative or mixed-methods approach?
- What is your research philosophy, and how did it shape your design?
- Why did you choose this sample, and how did you recruit participants?
- How did you decide on your sample size?
- Why did you use this data collection method rather than another?
- How did you analyse your data?
- How did you ensure the validity and reliability (or trustworthiness) of your study?
- What ethical issues did you consider, and how did you address them?
- Did anything go wrong during data collection? How did you respond?
- If you started again, would you change your methodology?
Sample answer: “Why did you choose a qualitative approach?”
“My aim was to understand how managers experienced the change, not to measure how common certain views were. A qualitative approach allowed me to explore their reasons and perspectives in depth. Semi-structured interviews gave participants space to raise issues I had not anticipated, which was important because there was little previous research on this group.”
Sample answer: “Would you change your methodology?”
“I think the overall design was appropriate for my research questions. With more time, I would add a small survey to test whether the themes from my interviews apply to a larger group of organisations. That would strengthen the generalisability of the findings, which I acknowledge as a limitation in Chapter 6.”
This type of answer works well because it defends your choices while showing that you understand their limits.
Findings and Analysis Questions (23 to 30)
- What are your most important findings?
- Which finding surprised you the most?
- How do your findings compare with previous studies?
- How did you deal with data that did not fit your expectations?
- Could your results be explained in another way?
- How confident are you in your conclusions?
- How do your findings answer each research question?
- What do your findings mean for the theory you used?
Sample answer: “Could your results be explained in another way?”
“Yes, one alternative explanation is that the more experienced participants were simply more willing to talk positively about the change. I considered this during analysis and compared responses across experience levels. The same themes appeared in both groups, which gives me more confidence in the interpretation, although I note it as a possible limitation.”
Limitations, Contribution and Future Research (31 to 36)
- What are the main limitations of your study?
- How far can your findings be generalised?
- What are the practical implications of your research?
- What would you recommend for future research?
- Which parts of your thesis could be published?
- What is the single most important thing readers should take from your work?
Sample answer: “What are the main limitations?”
“The main limitation is the sample. I interviewed participants from one region, so the findings may not apply to organisations elsewhere. The study also relies on self-reported views, which may be affected by how participants wanted to present themselves. I addressed this partly by asking for specific examples, and I recommend a larger, multi-region study in future research.”
Being open about limitations is a strength, not a weakness. Examiners expect you to know where your study’s boundaries are. Your conclusion chapter should already discuss them; see our guide on how to conclude a dissertation.
Reflective and Closing Questions (37 to 40)
- What have you learned from doing this research?
- What was the hardest part of the project?
- What would you do differently next time?
- Is there anything you would like to add before we finish?
For the final question, it is fine to briefly restate your main contribution, or to clarify a point you feel you did not explain well earlier.
Questions by Type: What Examiners Are Looking For
| Question type | What examiners want to see | How to prepare |
|---|---|---|
| Opening and summary | A clear, confident overview of your work | Practise a short summary out loud |
| Literature and theory | Awareness of your field and a justified framework | Revisit key sources and check for recent publications |
| Methodology | Deliberate, defensible choices | Write down why you made each decision and what alternatives you rejected |
| Findings | Accurate interpretation and links to the literature | Summarise each key finding in one or two sentences |
| Limitations and future research | Honest reflection and critical thinking | List limitations and how they could be addressed |
What to Do If You Do Not Know the Answer
- Pause and think. It is acceptable to take a few seconds before you reply.
- Ask for clarification if the question is unclear: “Could you rephrase that, please?” or “Do you mean in relation to my sample or my analysis?”
- Be honest. If you do not know, say so, then explain how you would find out or how the question relates to your work.
- Stay calm with critical questions. A challenging question is usually an invitation to discuss, not an attack. Acknowledge the point and explain your reasoning.
- Avoid getting defensive. Accepting a valid criticism and explaining how you would address it often makes a better impression than arguing.
How to Practise Before Your Defense
- Reread your whole dissertation in the week before, and mark key pages for quick reference.
- Write short answers to each question in this guide.
- Hold a mock viva with your supervisor, a colleague or a friend.
- Practise answering out loud, not just in your head.
- Prepare a list of minor errors or typos you have spotted, as examiners may ask about them.
Frequently Asked Questions
How long does a dissertation defense or viva take?
It varies by university and level. Master’s vivas are often shorter than PhD vivas, and a PhD viva can last a few hours. Your university’s regulations or your supervisor can tell you what to expect. Our PhD dissertation defense guide covers this in more detail.
Can I take my dissertation into the viva?
Most universities allow you to bring a copy of your thesis, often with brief notes or tabs. Check your institution’s rules first.
What are the possible outcomes of a viva?
Outcomes commonly include passing with no corrections, passing with minor or major corrections, or being asked to revise and resubmit. The exact categories depend on your university.
Do examiners try to make you fail?
No. Examiners want to confirm that the work is yours and that you understand it. Most of their questions are designed to give you the chance to explain and defend your research.
Need Support with Your Dissertation?
A strong defense starts with a well-written, well-argued dissertation. If you need help at any stage, our PhD dissertation writing service and dissertation writing services can support you.
