Some of your students may be sitting as far as 30 feet from the classroom monitors. Align body text flush left. Use no more than 25 words per screen. Avoid using black and white for text or background. Avoid textured backgrounds.
Solids are safe.
Avoid centering text except for titles. Using caps, color, bold, and underline are all excellent means of emphasizing text but be sure to use only one kind per presentation. Keep graphs and charts simple and use large labels. Allow sufficient time for participants to view the graphics and presentations. Avoid rapid switching between media.