A UK PhD candidate’s final hurdle is the viva voce, an oral exam that usually runs two to four hours. Two examiners question the candidate on their thesis and can recommend anything from an outright pass to failure. In many countries the viva is a formality. In the UK it is built to probe the work rather than rubber-stamp it.
The exam is normally held about three months after the candidate submits their thesis. A supervisor proposes suitable examiners first, and the university confirms them. Lauren Roffey, a candidate quoted by Times Higher Education, described her own viva as a 90-minute blur she had dreaded for months despite three mock run-throughs beforehand.
Who is in the room
A UK viva usually has one internal examiner, from the candidate’s own university, and one external examiner from elsewhere, chosen for their expertise in the thesis’s subject. Staff members being examined instead face two external examiners. The candidate’s supervisor does not attend.
At the Open University, every doctoral exam has a chair. The chair asks no questions. Their job is to moderate the session, keep procedure on track, and give the candidate somewhere to turn if they need a break or feel the process has gone wrong. Unlike the examiners, the chair need not be a specialist in the candidate’s field.
What the examiners are checking
Both examiners read the thesis in full before the viva and write independent reports on it, which they share with each other under confidence before the exam begins. St Andrews describes the viva’s purpose as confirming that the candidate wrote the thesis themselves, working through the examiners’ questions on it, placing the research in its wider field, and clearing up anything left unclear on the page.
The Guardian reports that the exam also exists to catch plagiarism and to confirm the candidate understands and can explain their own argument. A thesis with real weaknesses can still pass if the candidate defends it well in the room. The reverse holds too: a strong thesis paired with a poor defence can produce a worse result than the written work alone would suggest, according to notes from an Open University examiner-training workshop.
What a candidate walks away with
Examiners agree a joint recommendation once the viva ends, chosen from a fixed list of outcomes that runs from a pass with no changes through minor or major corrections to resubmission or outright failure. Times Higher Education notes that examiners can also award a lower degree instead. Liverpool’s guidance says a candidate handed corrections gets a list of exactly what to fix from the internal examiner, and sends the revised thesis back to the examiners directly once it is done.
A resubmission is a heavier outcome. It gives the candidate up to a year to rewrite the thesis and requires a second viva, this one chaired independently, before the university will confirm a result. Liverpool caps a candidate at two attempts at the same research degree.
Why it still unsettles people
Elizabeth Gibney, writing in Times Higher Education, described the exam as “labour-intensive, not conducted to any national standard”, and said students dread it because they fear an examiner might end their career on a whim. One candidate in research by Barbara Crossouard of Sussex said the viva left her “feeling as if I had been hit on the head”. She cried afterwards, convinced her years of research had been wasted.
That unpredictability is partly structural. Each university oversees its own vivas and no common UK standard exists, so the process can vary with the institution and with the examiners involved.
