How to prepare a talk or thesis defense, the questions included

Most of the work on a talk goes into the slides. The trouble on the day tends to come from three other places. The talk runs four minutes over. The sentence that was supposed to lead into the results section never comes back to you. The first question from the committee goes straight to the limitation you hoped nobody would notice. A talk has two halves, the part you planned and the questions you cannot plan, and the second half deserves as much preparation as the first.

Decide the one idea and the minutes

Simon Peyton Jones first wrote his advice on research talks in 1993, and Microsoft Research still publishes his slides. He gives about a fifth of a talk to the motivation and the rest to the key idea, and he answers within the first two minutes why the problem matters and what was found. He goes narrow and deep, skips the outline slide at the start and keeps the examples, because when time is short the general case is what should go. His rule for the end is strict. Finish on time without fail, and cut the talk short when you have to (Peyton Jones).

A thesis defense adds a committee and a fixed slot. The University of Neuchâtel’s checklist for doctoral candidates asks them to fit the presentation to the allotted time and to choose the essential content without trying to present everything (UniNE).

So plan in minutes and let the slides follow. Give each section a rough length, add the lengths up against your slot, and mark in each section the points you would drop if you were running late. If you do run late on the day, the decision has already been made.

Rehearse the talk as it will really go

Saying a talk and knowing it are different skills. The Neuchâtel checklist asks candidates to organize one or more mock defenses, and Peyton Jones suggests writing out the first few sentences word for word so the opening needs no thought at all. Time every run and note where it ran long.

Nerves before a talk are normal, and calming down is only one way to deal with them. In a study by Alison Wood Brooks, students had two minutes to prepare a speech. Those who told themselves they were excited were rated more persuasive and more confident than those who told themselves they were calm, and they spoke for longer (Brooks, 2014).

Prepare the questions as carefully as the slides

The questions after a defense follow your work closely. The Neuchâtel checklist names the likely areas as methodology, results, limitations and theoretical choices. It asks candidates to read the thesis again in full, list its weak points and the places that need clarifying, prepare a reasoned answer for each sensitive point and keep backup slides for the questions they expect (UniNE). Peyton Jones adds two things. Know the related work well enough to answer readily, and treat each question as a chance to connect with the audience.

The best answers come from your own material, meaning the paper, the code and the notes from the experiments. A committee member who asks how a threshold was chosen wants to hear the value, the reason behind it and what happened to the results when you changed it. Those three facts are usually sitting in a results folder or a notebook, and the time to find them is before the defense.

Two presenters, one talk

Group projects often end in a talk with two or three presenters, and the handovers are where they lose time. Agree on who gives which slides, rehearse each handover out loud and decide who answers which kind of question. Each presenter should know roughly where the others will be at each minute, so a slow first half does not quietly use up the last presenter’s time.

How Prepped helps with a talk

Prepped has a meeting type for this, Presentation and defense, with the title, the audience or committee, the length in minutes and the abstract. Under Slides and script you add the slides as a PowerPoint file or a PDF, and paste or attach your draft script. Prepped keeps the text and speaker notes of every slide. The paper, other documents, project folders and GitHub repositories can go into the same meeting.

Draft from the material writes the Talk outline from the slides and the script, with each section’s slides and rough minutes, and you can paste your own outline instead if you already have one. Each section has a presenter. For a section someone else gives, Prepped writes nothing for you to say and follows along by its slides. When the meeting is activated, Prepped writes what to say in each section, marks the points you can leave out when you run late, writes the sentences that lead into the next section, and prepares likely questions with answers drawn from your material. Statements about your work that the material does not support appear in square brackets.

Beside Activate meeting sits Rehearse. A rehearsal listens, follows your slides and answers questions exactly as the meeting will. When it ends, the meeting is still planned and nothing from the rehearsal goes into it. Each rehearsal is kept under Rehearsals with its transcript, its answers and how long each section took.

During the talk, the desktop app on Windows or a Mac watches the screen to see which slide is showing, in the slideshow, the presenter view or a shared window. The overlay shows the section you are in, the time used and left, and whether you are heading over time. For each new slide it shows the next sentences to say and key words for the rest, fitted to what you have already said, the time left and any slide you skipped. While a co-presenter speaks, it says who is presenting and shows the first sentence of your part. A question during or after the talk gets an answer that takes the talk into account, and Back to the talk gives you the sentence that returns you to your next point. Reading the slides costs small paid requests to a low-cost model, counted with the meeting.

If the meeting ends with the talk, Follow-up questions on its page starts the question session on its own, with the overlay showing only questions and answers. Talk and questions on the meeting’s overview compares each section’s actual time with the plan and lists every question with what you said in reply, which makes a good starting point for the next rehearsal.

If you work with Claude Code or Codex, your assistant can set all of this up from the repository where the slides and the script already live. Our guide to preparing meetings from your coding assistant shows how.