What Is a Mock Viva? Purpose, Limits and Practice
A mock viva is a structured practice oral examination before your real PhD viva. It lets you explain and defend your thesis aloud, respond to follow-up questions, and turn specific feedback into preparation actions. It is not a prediction of your result or a copy of your institution's formal process.
Why do a mock viva?
A formal viva lets examiners test your knowledge, thesis ownership and ability to defend the work; procedures vary by university. A mock creates a lower-risk setting to practise those same reasoning tasks. UCL explicitly advises candidates to practise and says a supervisor should provide a mock viva or arrange one with a suitable academic.
The most useful outcome is a short repair list. For example, a practice question may reveal that you can describe your method but cannot compare it with the strongest alternative. The repair is not “be more confident”; it is to prepare the question, evidence, alternative and limitation in one answer trace.
What a mock viva can and cannot do
| It can | It cannot |
|---|---|
| Test whether your explanation is clear to someone outside the project. | Predict the formal outcome or exact examiner questions. |
| Expose unsupported claims and weak follow-up answers. | Replace your university regulations, supervisor advice or reasonable adjustments. |
| Provide evidence for a focused practice plan. | Reproduce every institution's format, timing or examiner style. |
Who should run it?
Use the resources already around you: your supervisor, doctoral school, upgrade-panel member, research group or a knowledgeable peer. A supervisor knows the project history; someone less familiar can reveal where the thesis is unclear. Ask the facilitator to challenge the reasoning, not simply confirm that you sound fluent.
A simple practice loop
- Choose five decision areas: overview, contribution, method, evidence and limitations.
- Keep broad topics visible but exact questions unseen: this preserves diagnostic value.
- Answer aloud: start with a direct claim, then evidence, reasoning, alternative and boundary.
- Record only actionable feedback: identify the weakest three answers.
- Retest: use different wording after repairs, rather than repeating a memorised script.
Question: What is the main limitation of your thesis?
Controlled answer: The empirical setting is narrow, so the thesis makes a bounded claim rather than a universal one. The design gives depth in this context; a later comparative study would test whether the pattern holds elsewhere.
Before you book or run one
Check your own doctoral regulations and ask what support or reasonable adjustments are available. Cambridge notes that the actual viva enables you to defend the thesis, clarify matters and demonstrate field knowledge; local arrangements remain authoritative. A mock should support, not override, those rules.
Frequently asked questions
What is a mock viva?
It is a structured practice oral examination that tests explanation, reasoning and response to follow-up questions before the real viva.
Is a mock viva the same as the real viva?
No. It is a preparation exercise. Your institution and examiners determine the real format and outcome.
Who can run a mock viva?
A supervisor, suitable academic, panel member or prepared peer can do so; useful challenge and specific feedback matter most.
Run a structured practice session
Use the MockBase mock-viva protocol for question selection, timing and feedback. The PhD Viva Practice App supports rehearsal; it does not reproduce your formal assessment or guarantee an outcome.
Use the mock viva protocolOpen PhD Viva Practice AppOfficial sources
Checked on 6 September 2026. MockBase is an independent preparation service, is not affiliated with these institutions, and cannot predict or guarantee an assessment outcome.