Make a sketch of your visuals
Use a set of 4" x 6" index cards to do the sketches. 
The sketching process helps to identify what you want the visual to convey.
The cards can be rearranged in the stack to try out different presentation sequences.
The proportions of these cards are similar to those of overhead transparencies, 35mm presentation slides, and most projection screens.
OK, but . . .
How do you determine when you have too many visuals for use in your presentation? Here are a few words about timing . . .
Jeff Radel
Last Update: July 1999