Um guia claro e honesto sobre o que acontece em uma viva de doutorado – o formato, as pessoas presentes, as perguntas e os possíveis resultados.
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If your viva is approaching and you're not entirely sure what's going to happen when you walk into that room, you're not alone. The viva itself is usually far less intimidating than the version of it you've built in your head. So let's take the mystery out of it.
The external examiner. An academic from another university, usually someone with expertise in your area. They'll have read your thesis in full and will lead most of the [questioning](/blog/what-examiners-actually-look-for-in-a-viva). This is the person whose opinion carries the most weight in the outcome of your viva.
The internal examiner. An academic from your own university, though typically not someone who's been involved in your supervision. They provide institutional balance and often ask broader questions about your methodology or contribution.
The chair (sometimes). Some universities appoint an independent chair to manage the proceedings. They're not there to examine you – they're there to make sure the process runs fairly. Not all institutions use one.
Your supervisor (maybe). Policies vary. In some institutions your supervisor can attend as an observer; in others they're not allowed in the room. Where they are present, they typically can't speak or intervene. Check your university's regulations so you know what to expect.
> In US thesis defenses, your full committee is usually present, and you may give a presentation before questions. The principles in this guide still apply, but check your programme's specific requirements.
The examiners will usually put you at ease before they start. There might be a minute or two of small talk – how your journey was, whether you'd like some water. Don't mistake this for the process being casual. It's just human courtesy before a formal examination.
The first real question is almost always some version of: "Can you summarise your thesis for us?" This is your opening. You should have a clear, confident summary ready – three to four minutes, covering the problem, the approach, and the key findings. Don't read from notes. Speak naturally.
This sets the tone for everything that follows. If you come across as clear and in command of your material from the start, the rest of the examination tends to flow more easily.
There's no fixed script. Every examination is different because every thesis is different. But the questions tend to cluster around a few core areas:
Your contribution. What's new here? What do we know now that we didn't before? This is the single most important question you'll be asked. Have a clear, specific answer.
Your methodology. Why this approach? What are its limitations? Would you do it differently now? Examiners want to see that you made deliberate, justified choices.
Your literature. How does your work relate to the field? They may name specific scholars or texts and ask you to position your research in relation to them.
Your weaknesses. What's the weakest part of your thesis? What would you change? These aren't trick questions – they're testing your ability to critically assess your own work.
Specific passages. Examiners will have flagged particular sections, claims, or phrases. They'll ask you to explain, justify, or expand on specific parts of your text. You need to know your thesis well enough to engage with any page on demand.
For a detailed breakdown of the most common questions with guidance on how to approach each one, see our [50 common viva questions](https://vivacoach.ai/blog/50-common-viva-questions-and-how-to-answer-them).
Most examinations run between one and three hours, with two hours being typical. It can feel longer than it is – or shorter. Time behaves strangely when you're concentrating that hard.
There's no correlation between length and outcome. A short examination doesn't mean you've failed, and a long one doesn't mean you're in trouble. Some examiners are just more thorough, or they find your work interesting enough to discuss at length. Some excellent theses produce three-hour sessions simply because the examiners are so engaged with the conversation.
It's nerve-wracking at the start. That's normal. It passes, usually within the first ten minutes once you're into the conversation.
After the initial nerves, I found that it became unexpectedly enjoyable. You're talking to two people who have read your work properly, who are engaging with your ideas, and who want to have a serious conversation about your research. It is incredibly validating. For me, it was a real joy to have two strangers really engage and be interested in my work.
There will be moments when you don't know the answer, or where you feel pushed. That's fine. What matters is how you engage – whether you can think on your feet, acknowledge uncertainty honestly, and demonstrate that you understand your own research deeply enough to discuss it at this level.
One thing that catches some people off guard is occasional moments of silence. After you finish answering a question, the examiner might pause before moving on. They might be thinking, making a note, or deciding where to take the conversation next. Resist the urge to fill the gap with rambling. Let the silence sit.
"What if they ask me something I don't know?" They will. That's not a failure – it's part of the process. No one expects you to know everything tangential to your thesis. If an examiner raises a paper or method you're not familiar with, say so and engage with the idea thoughtfully. What matters is how you reason through it, not whether you have a ready-made answer.
"What if I go blank?" It happens. Take a breath, take a sip of water, and ask the examiner to repeat or rephrase the question. You can also say "Let me think about that for a moment." Nobody will judge you for pausing. Refer to your thesis if needed. Rushed, panicked answers are far worse than considered ones.
"What if the examiner is hostile?" Genuine hostility is extremely rare and unprofessional. What feels hostile in the moment is usually rigorous questioning – an examiner pushing back on a claim to see how well you can defend it. That's their job. If you've prepared well, you'll recognise the difference.
"What if I cry?" It's not the end of the world. Examiners have seen it before. Take a moment, compose yourself, and carry on. It has no bearing on the outcome.
After the questioning, you'll be asked to leave the room while the examiners deliberate. This might take five minutes or twenty. Then you'll be called back in and told the outcome. The typical outcomes are:
Pass with no corrections. Rare, but it happens. Your thesis is accepted as-is.
Pass with minor corrections. The most common outcome. You'll have a set period (usually three months) to make small changes – typos, clarifications, tightening an argument. This is a good result.
Pass with major corrections. Less common. Significant revisions are needed, usually within six to twelve months. This isn't a fail – the examiners believe the thesis can reach the required standard with further work.
Revise and resubmit. The thesis needs substantial reworking and will be re-examined. This is unusual and typically means there are fundamental issues with the argument or methodology.
Fail. Extremely rare. Most universities have processes in place long before submission to prevent this outcome. If you've been allowed to submit, your supervisors believe your work is at doctoral level.
> The vast majority of candidates receive minor corrections. If you've written the thesis and done your preparation, there's no reason to expect anything worse.
I remember when I was brought back into the room – "Congratulations, Dr. Allen" – It was truly an overwhelming moment after years of putting everything I had into this research effort. It was such a relief, I almost burst into tears.
Your thesis. A printed, annotated copy with sticky notes on key sections. You're expected to refer to it during the examination.
A notebook and pen. For jotting down corrections or feedback during the examination, and for writing everything down immediately afterwards while it's fresh.
Water. You'll be talking for hours. Bring your own rather than hoping there'll be some in the room.
Nothing else. You don't need slides, handouts, or props. Just yourself, your thesis, and your preparation.
Ready to start practising? See our [50 most common viva questions](/blog/50-common-viva-questions-and-how-to-answer-them).
The viva is the last step between you and your doctorate. It's meant to be challenging – that's the point. But it's not meant to be a mystery. Now you know the format, the people, the questions, and the outcomes. The only thing left is to prepare.
Want to practise answering viva questions based on your own thesis? [See our plans](/pricing).