What does viva voce mean?

It is Latin for with the living voice, and it means an oral examination, where you answer questions out loud instead of in writing.

Is a viva the same as a thesis defence?

They are close. Viva is the term used in the UK, Ireland and parts of Asia, and thesis defence or oral defence is common elsewhere. The format and rules depend on the university.

Yes, a viva can be graded as unsatisfactory, but most candidates who know their own work well and prepare answers to likely questions do well. Your regulations explain the possible outcomes.

What is a viva voce?

Last updated 29 October 2026

Viva voce is Latin for with the living voice. In education it means an oral examination: instead of, or as well as, writing your answers, you speak them to one or more examiners who ask you questions. People usually shorten it to viva. The word is most common in the United Kingdom, Ireland, India and Pakistan, while many European universities use the plain words oral exam or thesis defence for the same idea.

Where a viva is used

The best-known viva is the defence of a doctoral thesis: the candidate meets examiners who have read the thesis and asks them to explain and justify their work. Vivas are also used for master's dissertations, for undergraduate projects and in some courses, often to check that submitted work is the student's own and that the student understands it.

The exact rules differ between countries and universities, so always read your own institution's regulations.

What happens in a viva

The examiners usually begin with a general question, for example asking you to summarise your work and what you consider its main contribution. They then move to details: your choices of method, the strongest and weakest parts, how your results compare with other work, and what you would do differently.

The length depends on the level. A project viva can be short, while a doctoral viva commonly lasts well over an hour. Ask your department what to expect.

Typical questions

Questions vary, but these appear again and again in different forms.

Can you summarise your work in a few sentences?
Why did you choose this method or approach, and what else could you have used?
What are the main limitations of your work?
How does your work relate to what others have done?
What would you do next, or differently, with more time?
Can you explain this part of your report, code or data in more detail?

How to prepare

Reread your own work carefully and note every claim you make. For each one, be ready to say how you know it. Prepare a two-minute summary and a five-minute summary, and practise saying both aloud. Think of the three hardest questions a critical reader could ask and prepare honest answers.

If your viva follows a project, expect questions that check you really did the work: why a choice was made, how a part works, what went wrong. Being able to explain your own decisions matters more than knowing every detail by heart.

Outcomes

Outcomes depend on the institution. For a doctorate in the United Kingdom, common results are a pass, a pass with minor corrections, a pass with major corrections, or a request to revise and resubmit. For taught courses a viva usually contributes to a mark. Your handbook will say what applies to you.

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Frequently asked questions

What does viva voce mean?: It is Latin for with the living voice, and it means an oral examination, where you answer questions out loud instead of in writing.
Is a viva the same as a thesis defence?: They are close. Viva is the term used in the UK, Ireland and parts of Asia, and thesis defence or oral defence is common elsewhere. The format and rules depend on the university.
Can I fail a viva?: Yes, a viva can be graded as unsatisfactory, but most candidates who know their own work well and prepare answers to likely questions do well. Your regulations explain the possible outcomes.