What is PhD Oral Defense (Viva Voce)?
Meaning, Full Form & Guide (2026)
Quick Definition
The PhD oral defense (called viva voce in UK/Australia) is the final examination where a doctoral candidate presents and defends their completed dissertation to a committee of faculty examiners. A successful defense is required to receive the PhD degree. In the USA, the defense is typically public; UK vivas are private between candidate and 2 examiners.
PhD Oral Defense (Viva Voce) — Full Explanation
US format: public presentation (20–30 min) + closed-door committee questioning (1–2 hours). UK viva: private 2–3 hour examination with two examiners (one internal, one external). Possible outcomes: pass unconditionally, pass with minor corrections (most common in UK), pass with major corrections (revise and resubmit), or fail. Preparation: practise your 3-minute and 20-minute summaries, anticipate methodology critiques, and review recent papers in your area.
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