In an article in Forbes magazine, Carmine Gallo urges:
Try to apply the Rule of 3. Divide a presentation into three parts. Introduce a product with three benefits. Give me three reasons to hire you! The rule of 3—It worked for Jefferson, it worked for Jobs, and it will work for you.
Interesting philosophy. If it’s good enough for Thomas Jefferson and Steve Jobs, then it’s good enough for me! The only exception I can think of offhand is The Godfather Part III. That series should have stayed a two-pair.