What happens in a UK PhD viva?

After three or four years of work, your thesis is submitted and a date is set for your oral examination, the viva voce. Unlike in some countries, the UK viva is usually held in private, not in public, and it can genuinely change the outcome of your PhD. That combination is why it attracts so much anxiety. In a forthcoming paper in Assessment & Evaluation in Higher Education, I explore how students and examiners experience the viva. Here I want to offer something more practical: a plain guide to what happens.

Who is in the room?

Most UK vivas have two examiners. The internal examiner is an academic from your own university who has not supervised your work. The external examiner is an expert in your field from another institution, and usually leads the questioning. Many universities also appoint an independent chair, who does not examine you but makes sure the process is fair. Your supervisor may be allowed to attend as a silent observer if you ask, depending on your university’s rules.

How long does it last?

There is no fixed length. Many vivas last around two to three hours, but some are shorter and some run longer. Length tells you very little about the result. A long viva often means the examiners are enjoying a detailed conversation about your work.

What will they ask?

Every viva is different, but most follow a recognisable pattern:

• An opening question, such as “Can you summarise your thesis?” or “What drew you to this topic?” It is designed to settle you in.
• Your contribution: what is new in your work, and why it matters to the field.
• Theory and literature: why you chose your framework, and how your work relates to key debates.
• Methods: why you designed the study as you did, what alternatives you considered, and how you dealt with ethics, sampling and analysis.
• Findings and limitations: what your results show, what they do not show, and what you would do differently.
• The future: publications, next projects and the wider impact of your work.

Examiners are not trying to catch you out. Their job is to confirm that the thesis is your own work, that you understand it deeply, and that it meets the standard for a doctorate.

What are the possible outcomes?

The exact categories vary between universities, but they usually include:

• Pass with no corrections, which is relatively rare.
• Pass with minor corrections, the most common outcome: typically small changes completed within a few months.
• Pass with major corrections: more substantial revisions, often with a longer deadline and a second check by the examiners.
• Revise and resubmit: the thesis needs significant further work and is examined again.
• Award of a lower degree, such as an MPhil, or, very rarely, a fail.

Check your own university’s regulations so that you know exactly what each outcome means and what deadlines apply.

How to prepare

• Reread your thesis a week or two beforehand, as a reader, not an editor. Note typos on a separate sheet rather than worrying about them.
• Write a one-page summary of each chapter, and a few sentences on your three main contributions.
• Prepare for the obvious questions. Practise answering “What is your original contribution?” and “What would you do differently?” out loud.
• Read your examiners’ work. Knowing their interests helps you anticipate their questions and see where your work connects to theirs.
• Ask for a mock viva with your supervisors or colleagues. Speaking about your research under pressure is a skill, and it improves with practice.
• Check new literature published since you submitted, so that you are not surprised by a recent study.

On the day

Bring a copy of your thesis with tabs on the key sections, along with water and a notepad. It is completely acceptable to pause before answering, to ask an examiner to repeat or rephrase a question, or to say that something is a good point that you had not considered. Defending your choices does not mean refusing to admit any weakness. Examiners respect candidates who can discuss the limits of their own work honestly.

Remember too that you are, by this stage, the person who knows your thesis best. The viva is one of the few times in your career when two experts will read every page of your work closely and spend hours discussing it with you. Many people look back on it as a surprisingly rewarding conversation.

Afterwards

You will usually be asked to leave the room while the examiners agree their decision, then invited back to hear it. You will receive a written list of any corrections. Make a plan with your supervisor, work through the list carefully, and keep a short note of how you addressed each point. It makes the final check much quicker.

When my paper on students’ and examiners’ experiences is published, I will share its findings here. In the meantime, if you are preparing for your viva and would like support, I offer mentoring for doctoral students.