By the time you reach your viva, the research is done. What's being tested now is different: can you own your work — explain why you made every major choice, where its limits are, and what it contributes? Examiners can tell within minutes whether a thesis is truly yours.
What examiners are really assessing
- That the thesis is your own work and you understand it deeply.
- That your methodology was justified, not just executed.
- That you know your study's limitations — and can defend them anyway.
- That you can place your contribution in the wider field.
The questions you can expect
- 1In one or two sentences, what is your thesis about and why does it matter?
- 2Why did you choose this methodology over the alternatives?
- 3What is your original contribution to knowledge?
- 4What are the limitations, and how would you address them?
- 5If you started again, what would you do differently?
Reading your thesis silently is not viva prep. Rehearse answers aloud — ideally in a mock viva with someone who will push back. Fluency under questioning is a skill you build by practising it.
A simple preparation plan
Re-read your thesis as a critic would, annotate every choice with its justification, prepare a crisp summary of your contribution, and list your limitations before the examiner does. Work through our viva checklist and the thesis & viva hub, and consider a mock viva through viva preparation mentoring.
Frequently asked
How long does a PhD viva last?+
Most vivas run between one and three hours, though it varies by institution and country. The duration says nothing about the outcome — a longer viva often just means a genuinely engaged discussion.
Can I fail my viva?+
Outright failure is rare. Far more common outcomes are minor or major corrections. Thorough preparation and honest ownership of your work make a clean result much more likely — but no one can guarantee an outcome.
phdguide's mentors are senior academics, former supervisors, statisticians and publication specialists with 25+ years of combined experience guiding MBA, MPhil and PhD scholars from topic to viva.
Ethical, compliant guidance: We provide academic support, mentoring, analysis, editing and structuring — not authorship. Your work stays compliant with university policies.