10/20/30 rule for presentations

http://blog.guykawasaki.com/2005/12/the_102030_rule.html

Talks about a "10/20/30 Rule of PowerPoint". Let's not bebiased here - lets call it the 10/20/30 rule for presentations - Open Office Impress does a fantastic job of making presentations also - ans there are others.

Guy says that a "presentation should have ten slides, last no more than twenty minutes, and contain no font smaller than thirty points."

He says that

The ten topics that a venture capitalist cares about are:

1. Problem
2. Your solution
3. Business model
4. Underlying magic/technology
5. Marketing and sales
6. Competition
7. Team
8. Projections and milestones
9. Status and timeline
10. Summary and call to action

I like this 10/20/30 rule - at least the principal. If you need to be verbose, put it in the notes. I see so many presentations that have a multitude of gunshots and other sounds, written as if it is an essay, and transitions that blow the mind.

What would be a good rule of thumb for middle school kids to use? 10 slides is probably more than enough (too many), 20 minutes is far to long (5 at the most and usually more like 2 or 3) 30 point font is cool.