First, what does it take to give a successful Ph D Defense?This means that use of jargon and highly technical terms will only put your audience to sleep. Simplify it the best that you can and put it in the larger context of your research field.Use cartoons or model slides (if necessary) to give your audience the general, overall picture.Your talk/presentation is only as good as you want it to be.And you cannot fully prepare for all the endless possibility of questions.If you already have most your slides ready to go, then you are lucky. And this means that you don’t cram it all in a couple of days right before your talk. You certainly don’t have to memorize every word of your thesis defense talk, but you should have it well-polished.I ended up getting data at the last minute and my story changed. I’m not talking about giving just one practice talk. There is no limit (or requirement) on how many practice talks you should give, but give as many talks as it takes until you feel like you are ready.When you watch the talk, ask yourself what makes it good or bad? If you are, the thesis defense talk is just a formality.If you cannot obtain any thesis defense talks on video, make sure that you go to actual public thesis defense talks.How can you prepare, keep the stress levels low, and make sure you have the highest chance of success?I’ll just say that everyone’s Ph D Defense is unique and is unpredictable.