[ClearCase_guy]

I remember teachers using overhead projectors. They would scribble things while they talked. Often their handwriting was hard to read. They sometimes made mistakes (I remember math teachers frequently going off the rails).

A good Powerpoint presentation is easy to read, easy to understand, and contains no errors.

Of course, I've seen a great many bad powerpoint presentations. But they can be done well.

[Poser]

Overhead projectors were evil too.

My accounting professor: (puts up slide)Here the answer to problem 6-2A. Any questions?

(Students stare blankly at a full screen of numbers)

Professor: OK. (removes and replaces slide) Here is 6-3A. Any questions?

I teach accounting now. I draw and complete every problem on the board at the same speed a student would do it. I stop along the way to answer questions.

No overhead. No PowerPoint. No problem.