A viva is not a test of whether you can remember your work. It is a test of whether you understand it well enough to explain, justify and defend it while someone asks you questions. That needs a different kind of preparation from a written exam, and the good news is that it can be practised.
What examiners are actually looking for
Whether it is a project viva, a lab viva, an oral exam or a thesis defence, examiners usually want to establish three things:
- That the work is yours. You can talk about decisions and details that only the person who did the work would know.
- That you understand it, not just remember it. You can explain why, not only what, and apply your ideas to a situation you haven't seen.
- That you know its limits. You can say honestly what your work does not show and what you would do next.
Keep those three in mind as you prepare. Almost every viva question is a way of testing one of them.
Step 1: Re-read your work as an examiner would
Read your report, thesis or notes from start to finish, but this time with a pen and a sceptical mindset. On every page, mark:
- Every claim you make. Could you defend it if someone said "How do you know?"
- Every choice you made: a method, a dataset, a sample size, a design. Could you explain why you chose it over the alternatives?
- Every term you use. Could you define it simply, without your notes?
- Anything you feel uneasy about. That unease is usually exactly where the examiner will go.
Also look for small errors such as typos, inconsistent figures or mislabelled tables. It is far better to spot them yourself and say "I noticed an error on page 14" than to be caught out by them.
Step 2: Predict the questions
You can't know the exact questions, but most vivas draw on a familiar set. Prepare a short answer to each of these:
- Summarise your work in two minutes.
- Why did you choose this topic, and why does it matter?
- Walk me through your method. Why this method?
- What are your main findings or results?
- What are the limitations of your work?
- What would you do differently if you started again?
- How does your work relate to other work in the field?
- What would you do next with more time or resources?
Then add questions specific to your work, using the marks from Step 1. A useful trick is to sort them by depth. Some test recall ("What sample size did you use?"), some test explanation ("Explain how your algorithm works"), some test application ("What would change with twice the data?") and some test analysis ("Why is your approach better than X?"). Most students over-prepare recall and under-prepare application and analysis.
Step 3: Practise your answers out loud
This is the step most people skip, and it matters most. Knowing an answer in your head and saying it clearly under questioning are different skills. When you speak, you find out quickly where your understanding is thin: you start a sentence and realise you can't finish it.
Ways to practise:
- Explain it to an empty room. Set a timer for two minutes and summarise your work. Record it and listen back.
- Ask a friend to question you. Give them your list of questions and ask them to interrupt with "Why?" as often as they like.
- Use an AI viva practice tool. With The Thinking Speaker's Viva Prep you upload your own report or notes, answer generated viva questions out loud, and get an understanding profile showing whether you are strong on recall but weaker on application or analysis.
Whatever method you use, aim for answers that are short and structured: give the direct answer first, then the reason, then an example from your work. If an answer runs past two minutes, cut it.
Step 4: Prepare for the questions you can't answer
At some point you will be asked something you don't know. That is normal and expected; examiners often push until they find the edge of your knowledge. What matters is how you handle it.
- Pause before answering. A few seconds of thinking looks considered, not lost.
- Ask for clarification if the question is unclear: "Do you mean the method or the results?"
- Reason out loud from what you do know. "I didn't test that directly, but based on the results in chapter 4, I would expect…"
- Be honest. "I don't know, but this is how I would find out" is a strong answer. Bluffing is usually obvious and costs more than admitting a gap.
Practise this too. Ask your practice partner to throw in questions you haven't prepared, and rehearse staying calm.
Step 5: The day before and the day itself
- Do one light practice run the day before, then stop. Cramming the night before rarely helps with a viva.
- Bring a copy of your work with sticky tabs on key pages, if you are allowed to. Being able to find a figure quickly is reassuring.
- Arrive early and have water with you.
- Listen to the whole question before you start answering.
- Treat it as a conversation. Examiners are usually interested in your work. Showing that you are interested in it too goes a long way.
A one-week viva preparation timetable
If your viva is a week away, around an hour a day is plenty:
- Day 1: Re-read your work as an examiner (Step 1).
- Day 2: Write your question list (Step 2) and draft short answers.
- Day 3: First out-loud practice session. Note where you stumble.
- Day 4: Revise the weakest areas, especially application and analysis questions.
- Day 5: Practice session with someone questioning you, or an AI viva session.
- Day 6: Practise the "I don't know" answers and your two-minute summary.
- Day 7: One calm run-through, then rest.
The aim is not to memorise answers. It is to understand your own work well enough that, whatever the question, you can think it through out loud.