Supporting material
 
 
Photos, charts and graphics 
- Are excellent ways to get across simple illustrative messages
- But they must be prepared for the purpose
 
 - Scans of hardcopy, or straight screen clips are rarely satisfactory 
- Except for purposes of annotation
 
 
Labeling
- Use a plain "sans serif" font such as Arial 
- On a web site, don't use a size smaller than 10 point, preferably use larger!