Tips for a Ph.D. defense

Congratulations on making it to this point!

⁠The fact that your advisor scheduled your defense is a strong sign that you’re more than ready. A failed defense arguably looks worse for the advisor than for the candidate.

⁠The previous paragraph assumes that you did not insist on scheduling after being told you’re not ready. Your advisor understands the process far better than you. A word to the wise is sufficient, but for a fool not even a stick helps. Don’t play the fool.

A few high-level points should boost your confidence.

• The defense should be a formality with a high expectation of a pass, perhaps with minor revisions.
• The defense is of the dissertation narrowly, not your mastery of every obscure corner of the field and certainly not of all human knowledge.
• It is your story, your victory lap.
  • You are the expert. You lived through all of the ups and downs.
  • Tastefully include brief comments along the way about inspiration, surprises good and bad, you getting in your own way, and nonlinear research progress.
  • Be relatable, but don’t bog down in minutiae.

Put your audience and especially your committee in a good mood.

• Provide your committee with handouts of your slides to follow along.
  • Consider printing them 4-up and double-sided to save paper.
  • If you have access to a comb binder or even 3-ring pocket folders, some binding will look better than a stapled pile of paper.
• Bring snacks! As a professional showing courtesy to your audience and to lift their mood, provide coffee or water, cookies or donuts, napkins, and paper plates, for example.

Expect a few things to go wrong, and leave yourself room to recover.

• Arrive an hour early to troubleshoot the computer that will host your presentation, your ability to login, the projector, your slides, microphone, Zoom connection, etc. as appropriate to your setup.
• If you are prone to presentation nerves, then plan to deal with that too.
  • If the overwhelm starts peaking, get to a stopping point and announce a 5-minute break.
  • Depending on your talk’s length, you might build in one or at the very most two breaks — as in having a slide or two with BREAK and informing your audience during your introductory remarks what the overall schedule will be.
  • Your audience will appreciate being able to stretch their legs, go to the restroom, visit with others, or grab another cookie and cup of coffee.

Keep the structure of your talk straightforward.

• Answer the “So what?” question up front with a summary of your overall contributions.
• Use more or less the same order as your dissertation.
• Provide signposts along the way to orient your audience.
  • At the beginning of each dissertation chapter’s section, summarize what that portion of the work sought to investigate, any motivators, your hypotheses, and how you quantified success or failure.
  • At the end of each, summarize that chapter’s incremental contributions.
• Have a few ideas for future research directions or commercial applications to build on your work.

Good luck! You’re going to do great and receive a wonderful greeting from your committee: “Congratulations, Dr. So-and-so!”

Further Reading

• The Craft of Scientific Presentations: Critical Steps to Succeed and Critical Errors to Avoid (paid link), 2nd edition, by Michael Alley: guidance on explaining research clearly, designing slides around evidence, and developing confidence as a presenter.
• How to Survive Your Viva: Defending a Thesis in an Oral Examination (paid link), 3rd edition, by Rowena Murray: preparation for the oral examination, with an emphasis on practicing how to discuss and defend your research. Written for the viva tradition, so adapt the advice to your department’s defense format.