Write a summary slide for each section of your talk, even if you don't use it.

You should probably use an outline slide in your presentation and return to the outline after each section of your talk.

I recommend creating a summary slide at the end of each section and before you return to the outline slide. This slide should recap the points the audience should have learned from the slides in that section.

You may ultimately choose not to use the section summary slides in your oral presentation. They may make the presentation too repetitive and pedantic. Still the process of making the summary slide will force you to consider whether the audience has learned what you want them to learn. Perhaps more importantly, it will force you to think though what you want the audience to learn!

The narrative defines the slides, the slides don't define the narrative

The slides you include in your presentation should support an overall narrative or "story." As such, you should define your story prior to making slides. What is the problem? Why is it important? How am I approaching it? What results do I have so far? What have we learned? etc.

It is often difficult to articulate a narrative after months at the lab bench and many scientists begin the presentation process by creating slides. Slide making can get you thinking. That's OK, as long as you step back at some point and articulate your story in some type of narrative form. Otherwise you will end up with a largely meaningless collection of slides. The slides-narrative process can be iterative.

After defining the narrative, the process of slide making may lead you off in unanticipated (by the narrative) directions. Perhaps you remember some really exciting data that doesn't fit with the narrative. Fine, include it, but pull back and rewrite your narrative. A coherent narrative is the essential building block of a presentation.

How to skip around in the middle of a presentation

One of the advantages of the acetate slide era was that it was easy to call up the particular slide you wanted at a particular time. With PowerPoint a lot of speakers feel they need to click through all their slides to get to a particular slide. There is a better way.

1. Hit the slide sorter command on your presentation. You'll see the slides along with their corresponding number (the numbers are a little hard to see on the figure below, but they are just below the lower left corner of each slide).

2. Take a screen shot of your slides (cmd-shift-4)

3. Print out the screen shot and take the printout to your talk

4. At any point in the presentation mode, you can enter the number of the slide on the screen shot, hit return and you will get right to the slide