Viva Preparation

What examiners are doing

Format varies considerably between countries and institutions — the number of examiners, whether it is public, whether an independent chair attends, how long it runs, and what outcomes are available. Your own regulations are the authority, and reading them beforehand is worth an hour.

What is fairly constant is the purpose. Examiners are establishing that the thesis is your own work, that you understand it well enough to have produced it, and that you can account for the decisions in it. They are also, in most systems, deciding what corrections are needed — which is usually the real question rather than pass or fail.

They will have read the thesis closely, and they will have found its weak points. That is their job and it is not hostility. An examiner pressing on a limitation is testing whether you understand it, not accusing you of hiding it — and a candidate who acknowledges it readily is answering the question correctly.

They will also usually be interested. Doctoral examining is work people take on because they care about the field. Candidates who go in expecting an interrogation often find a conversation.

The questions that come up in almost every viva

The specifics vary; these recur in some form across disciplines and systems, and preparing them is time well spent.

• Summarise your thesis in a few minutes. Frequently the opening. Practise it aloud, because it is harder than it looks and stumbling here sets an unhelpful tone.
• What is your original contribution? One sentence: this thesis shows that…, which matters because… If you cannot say it without notes, work on it before anything else.
• Why this methodology, and not the obvious alternative? Have the rejected option and your reason ready. This is the question a weak methodology chapter is caught by.
• What would you do differently? A question about judgement, not an invitation to confess. Answer with something specific you learned, not a list of regrets.
• What are the limitations? Name them yourself, precisely, and say what each rules out. Raising them first is far stronger than being led to them.
• How does this relate to [a study the examiner knows well]? Often their own work, or a paper central to the field.
• What happens next? Where the research goes, and what you would publish first.

Then the question that decides how the rest goes: something you cannot answer. It will happen. “I hadn’t considered that — my initial thought is…, though I’d want to look at it properly” is a good answer. Inventing something is not, and examiners can tell.

How to prepare in the weeks before

1. Re-read the thesis as a stranger would. You have not read it end to end for months, and you will find things you had forgotten arguing.
2. Make a short document of key facts. Sample sizes, the main results, your key references. Most systems allow you to bring an annotated copy — check yours — and needing a number you cannot recall is an avoidable stress.
3. Find your weakest point and prepare it. You know what it is. Write out how you would defend it, and what you would say if the examiner is right. A candidate who names the weakness first is in control of that exchange.
4. Read your examiners’ work on your topic, particularly where your thesis disagrees with theirs. Not to flatter them — so you are not surprised.
5. Prepare the corrections conversation. Most vivas end with corrections. Knowing that in advance stops it feeling like failure when it happens.
6. Have a mock viva. The single most useful thing on this list, and the reason it is worth its own section below.

Why a mock viva is worth more than another read-through

The gap between knowing your thesis and being able to defend it aloud is larger than most candidates expect, and it only closes by practising the second thing.

A mock does three things reading cannot:

It surfaces the questions you had not thought about. Everyone can defend the parts they worried about. What catches people out is the question from an angle they never considered — and there is still time to think about it if it arrives in a mock rather than the real thing.

It reveals what you cannot yet say out loud. A defence that is clear in your head and comes apart in speech is common, and entirely fixable with practice.

It makes the real one familiar. Much of viva anxiety is unfamiliarity with the situation itself. Having sat through one version reduces that substantially.

It works best with someone who has examined doctorates and is not invested in your success — a supervisor knows the work too well and is too close to it to ask the naive question an external examiner will. Ask for it to be genuinely difficult. A comfortable mock is a wasted one.

On the day

• Take your time answering. A pause to think reads as consideration, not ignorance. Candidates rush from nerves and answer a question that was not asked.
• Ask for clarification if a question is unclear. That is normal and expected.
• Disagree where you have grounds to. A viva is an academic conversation, and defending a position with evidence is what you are there to demonstrate. Conceding every point does not read as humility.
• Concede where they are right. Equally important, and the two together are what judgement looks like.
• Do not read from notes. Use them to check a number, not to answer.
• Expect it to be long, and expect not to be able to judge how it went afterwards. Candidates routinely misjudge this in both directions.

Outcomes and corrections

Available outcomes differ by institution, and yours will be listed in your regulations. What is broadly true is that some form of corrections is the normal result, and that outright failure is rare — not because standards are low, but because supervisors do not usually allow a thesis to be submitted that is not close.

Corrections are not a judgement on you. They are the examiners saying what would make a good thesis better, and they usually come with a deadline that is generous relative to the work involved.

Two practical points. Take notes during the viva, or ask whether you may — the correction list makes far more sense later if you recorded the reasoning behind each point. And if you disagree with a correction, there is usually a route to discuss it, though picking that fight is rarely worth it unless the point is substantive.