The viva and thesis defence

A viva (viva voce, "with the living voice") or thesis defence is an oral exam on your thesis. Formats differ: in the UK and India, often a private discussion with two or more examiners; in the US and much of Europe, often a public talk followed by questions.

What examiners want to know

• Did you do the work, and do you understand it deeply?
• Can you explain your choices: why this method, this data, this analysis?
• Do you know the limitations and the field around your work?
• Can you discuss what comes next?

Most examiners want you to pass. They're testing understanding, not trying to trap you.

How to prepare

1. Reread your thesis in the weeks before. Note errors you've since found; mentioning them yourself shows care.
2. Summarise each chapter in a paragraph, and your whole thesis in one sentence.
3. Prepare common questions: What's your main contribution? What would you do differently? What are the weaknesses? How does this relate to [major paper]? What's next?
4. Read recent work by your examiners and recent papers in your area.
5. Hold a mock viva with your supervisor or colleagues.

On the day

• Bring your thesis, tabbed, and a notebook.
• Take your time to think before answering; it's fine to pause or ask for a question to be repeated.
• Treat it as a conversation between researchers: you're the expert on this thesis.

RememberKnow every choice and limitation, prepare the classic questions, hold a mock viva, and treat the day as a conversation.