What is a thesis defence and how does it work?
The defence is the oral examination on your thesis. Some universities call it a colloquium or disputation. It has two parts: a talk in which you present your research question, approach and results, and a discussion in which the first and second examiners ask questions.
- 20 to 45 minutesis how long the defence lasts in total, depending on the examination regulations
- 10 to 20 minutesof that time are for your talk
- 10 to 25 per centof the overall grade is common; sometimes it is graded separately
The defence does not test whether the thesis is good, but whether you have really understood it.
The examiners have read your thesis and have usually already written their assessment. What matters is whether you can do three things, and every part of your preparation aims at exactly that:
- Justify decisions
- Put results into context
- Take criticism on board
Preparation in three phases: four weeks, one week, the last day
- Read your whole thesis again as if you were the examiner.
- Write down the key message of each chapter in one sentence.
- Mark the places where you have doubts yourself. That is where the questions will come.
- Clarify the formalities: duration, technology, who will be present, assessment.
- The slides are finished.
- Give the talk out loud twice with a stopwatch, once in front of an audience. Flatmates are enough.
- Go through the list of questions below and prepare an answer of two to three sentences for each one.
- No new content.
- Check the technology: laptop, adapter, presentation as a PDF on a USB stick.
- Lay out your clothes and plan your journey.
- Know the first two sentences of your talk by heart. They carry you through the nerves of the first minute.
The presentation: a structure in 10 to 12 slides
Twelve slides are enough for 15 minutes; more makes you rush. A proven structure with timings:
- Slide 1Title and short introduction30 sec.
- Slide 2Motivation: why the topic is relevant1 min.
- Slide 3Research question and aim1 min.
- Slide 4Theoretical framework, only the concepts you need later2 min.
- Slide 5Method: design, data collection, analysis2 min.
- Slides 6 and 7Results, one finding per slide, visualised4 min.
- Slide 8Discussion: what the results mean2 min.
- Slide 9Limitations of the thesis1 min.
- Slide 10Conclusion: the answer to the research question1 min.
- Slide 11Outlook and thanks30 sec.
- One message
- At most six lines of text
- Font size no smaller than 20 points
- Results as a chart or table, not as running text
How to design the slides in detail is shown in Presentation for your defence: a structure in 12 slides. If you would rather have slides and preparation from a single source, we take care of that as part of our defence and presentation service.
The 20 most common examination questions, with an answer strategy
Examination questions are more predictable than they feel. Most of them fall into five groups. For each question you will find the strategy here, not the finished answer, because that has to fit your thesis.
- Why did you choose this topic?
Academic interest plus a concrete gap you noticed. Not: “Because it was offered.”
- What is the relevance of your research question?
Name two levels: academic (research gap) and practical (benefit for companies, schools, clinics).
- How did your research question change during the process?
Describe it honestly. A sharpened question is a sign of quality, not a flaw.
- How does your thesis fit into the state of research?
Name two or three key studies and say what you build on.
- Why this method and no other?
Name an alternative and explain why it fits the question less well.
- How did you select your sample?
Criteria, access, size. Name the limits openly.
- How do you ensure the quality criteria?
Objectivity, reliability, validity or their qualitative equivalents, each with a concrete example from your thesis.
- What role did you yourself play in the research process?
For qualitative research, reflection on your own position; for quantitative research, standardisation.
- What is your most important result?
One sentence, then the reasoning. Do not list every finding.
- Which result surprised you?
Have an example ready and explain how you interpret it.
- How robust are your results?
Sample, context, measurement: you know the limits better than the examiners.
- What would you have done differently with more time or data?
Two concrete points, not an avalanche of self-criticism.
- The theory chapter is very broad. Why?
Do not defend it; explain its purpose and admit where you would shorten it today.
- Your interpretation at point X is bold. How do you justify it?
Name evidence from your data and the literature and acknowledge an alternative reading.
- What is a weakness of your thesis?
Name one that you kept under control and say how you limited it.
- Why is author Y missing from your reference list?
If you know the work, place it briefly. If not, note it gratefully and do not bluff.
- What follow-up research arises from your results?
Two concrete study ideas with a design.
- What do your results mean for practice?
Recommendations that follow from the data, not from wishful thinking.
- If you wrote the thesis again, what would stay the same?
A question about your conviction: defend the core, let the details go.
- What do you personally take away from the thesis?
One subject-related and one methodological lesson are enough.
Typical mistakes in the defence and how to avoid them
- Reading out
If you read your slides aloud, you seem unprepared.
Keywords on index cards, eyes on the examiners.
- Too much theory
Examiners want to hear your results, not the definitions from chapter 2.
Cut the theory down to one slide.
- Overselling results
“Proves” is almost always wrong.
“Shows”, “indicates” and “suggests” are the right verbs.
- Fending off criticism
“Yes, that is a limitation of my thesis, for the following reason …” earns more marks than any defence.
- Running over time
Examiners do not like to interrupt, but they take it into account.
Rehearse with a stopwatch. Aim for one minute under the limit.
Nerves: what really helps
Nerves do not disappear through good advice, but through preparation and a few physical tricks.
- A trial talk in front of real people
The most important step. If you have given the talk twice to listeners, you know where you stumble.
- Breathe out slowly
Before you start, four seconds in, six seconds out, three times.
- Have water ready
A sip gives you time to think when a question is difficult.
- Say so openly if you do not know
“I cannot answer that from my data, but I would assume …” is a complete and confident answer.
Checklist for the day
- Presentation as PowerPoint and PDF, on your laptop and a USB stick
- Adapter for the projector, remote control, charging cable
- Printed thesis with the key passages marked
- Index cards with keywords for the talk
- List of your most important sources, each with a one-sentence key message
- Answers to the 20 questions above, practised out loud
- Water, a watch, appropriate clothing
- Arrive 20 minutes before the start
How to make your thesis watertight before submission so that no unpleasant surprises await you in the defence is explained in Checklist before submission: 25 points to check.
Related to this article
Further sources
- Microsoft Support: PowerPoint Official guides to slide masters, templates and notes
- Deutsches Studierendenwerk Psychological and social counselling at all university locations in Germany
Frequently asked questions
How long does a thesis defence take?
Depending on the examination regulations, 20 to 45 minutes: a talk of 10 to 20 minutes, followed by the discussion with the examiners.
Can you fail the defence?
Yes, but rarely. A defence is usually failed when it becomes clear that the thesis was not understood independently, for example because basic decisions cannot be explained. If you know your thesis and respond honestly to criticism, you will pass.
How many slides do I need for 15 minutes?
Ten to twelve. As a rule of thumb, about one slide per minute, with results slides getting more time than the title and closing slides.
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