Preparing for your PhD viva: a practical checklist

The viva — the oral defence of your thesis — is the one exam where you already know more about the subject than almost anyone alive. You wrote the book. And yet it is the exam people find most nerve-wracking, because the format is unfamiliar and the questions are open-ended.

The good news is that viva preparation is a skill you can practise, not a personality trait you either have or lack. What follows is a practical checklist, organised roughly by how far out you are. Adapt the timeline to your own submission date.

What the viva is actually testing

Before the checklist, it helps to be clear about the purpose. Examiners are generally trying to establish three things:

1. That the thesis is your own work and you understand it deeply.
2. That you can defend your choices — why this method, this framing, these limitations — rather than just report them.
3. That you can situate your work in the wider field and discuss where it goes next.

Almost every question maps back to one of those three. Keeping that in mind turns a scary open format into something you can prepare for systematically.

Four to six weeks out: re-read your thesis as a critic

You have not read your thesis cover to cover since you submitted, and by now it feels like someone else wrote it. Read it again — but not as the proud author. Read it as the examiner whose job is to find the weak points.

As you go, keep a running list of:

• Every claim that a sceptic could challenge. For each one, note the evidence that backs it and where that evidence sits in the thesis.
• Every methodological choice. Why this approach and not the obvious alternative? What did you gain and give up?
• Every limitation you admitted. Examiners will ask about these; better that you have a considered answer than a defensive one.
• Typos and errors. Note them so you can acknowledge them calmly if raised, rather than being caught off guard.

If your notes are anchored to the exact passages in the thesis, this pass doubles as a map you can revise from later.

Three weeks out: anticipate the questions

Most viva questions are more predictable than they feel. Build a bank of likely questions and draft answers. Reliable categories include:

• The opening. "Summarise your thesis in a few minutes" or "What is your original contribution?" You should be able to answer both crisply. Rehearse the contribution until it is one clean paragraph.
• The why questions. Why this topic, this theory, this method, this sample? Have a reason for each — "it was convenient" is rarely enough.
• The alternatives. "Why did you not do X instead?" Show you considered it and made a deliberate choice.
• The limitations and future work. Turn these into strengths: you know exactly what your work does not do, and you know what should come next.
• The wider field. How does your work relate to the two or three most important papers around it? Be ready to place yourself on that map.

Write your answers down, then say them out loud. The gap between "I know this" and "I can articulate this under pressure" only closes with speaking practice.

Two weeks out: know your examiners' world

Find out who your examiners are and read enough of their work to understand their perspective. You are not trying to flatter them — you are trying to anticipate the lens they will bring. An examiner known for a particular methodological stance will likely probe your methods through that lens. Knowing this lets you prepare rather than improvise.

Re-read the handful of papers your thesis leans on most heavily, and the most important recent work in your area. If a key paper came out after you submitted, be ready to discuss it — "how does your work relate to this new finding?" is a fair and common question.

A useful exercise: for each core paper in your field, be able to say in one sentence how your work agrees with it, extends it, or departs from it. If you can do that for your ten most important sources, you can hold your own on the wider-field questions.

One week out: rehearse for real

Do at least one mock viva with a supervisor or peer who will genuinely push you. The value is not in the specific questions — it is in practising the experience of being challenged and responding thoughtfully rather than defensively.

Rehearse the meta-skills too:

• Buying thinking time. "That is an interesting question — let me think about it for a moment" is a completely acceptable thing to say. Silence while you think is fine.
• Disagreeing well. You are allowed to defend your position against an examiner. Do it with evidence and courtesy, not with concession or combativeness. "I take the point, but I would argue that..." is exactly the register.
• Conceding well. If they find a genuine weakness, acknowledging it honestly is a strength. "You are right, that is a limitation, and here is how I would address it in future work."

The day before: settle, do not cram

Cramming new material the day before helps no one. Instead, re-read your own summary notes, your contribution paragraph, and your list of anticipated questions. Sort out the logistics — where, when, what to bring, whether it is in person or remote. Get a normal night's sleep. You have done the work; the last day is for calm, not for panic.

On the day

Bring a clean copy of your thesis, ideally tabbed or annotated so you can find any section quickly. When a question comes, it is fine to open the thesis and point to the relevant passage — it demonstrates command of your own work. Answer the question that was asked, keep your answers grounded in what you actually did, and remember that a viva is a discussion between researchers, not an interrogation.

The underlying idea

Everything on this checklist reduces to one thing: be able to defend every claim you made, with the evidence you based it on close at hand. That is exactly the situation a well-organised set of notes — anchored to the passages they came from, linked to the claims they support — is built for. Prepare that way, and the viva becomes what it is supposed to be: the moment you get to talk, at length, with genuine experts, about the thing you know best.