Wildfire Prevention Conducting School Programs Guide - National ...

Using charts
Charts are inexpensive, easy to make and use, and easily changed or
replaced. They can be very effective and flexible.
Charts help to win and hold the attention and interest of the audience.
They can clarity ideas that would be difficult to express in words
alone. An average speaker can excel in getting points across by using
a well- organized set of charts.
The American Standards Association has set the following specific
minimum criteria and size standards applicable to all types of displays
and wall charts.
• Minimum size of the smallest lettering should be about 1/50 of
the height of the sign.
• The standard shape of the chart or display is a height-to-width
ratio of 3:4.
• A general rule also can be applied to determine the needed size
of direct display charts. The minimum desired width must be 11
6 of the maximum viewing distance. For example, if a student
at the rear of a classroom is 24 feet away from the front
blackboard where a poster is displayed, the width of the poster
must be at least four feet (1/6 of 24). Then the standard vertical
height would be three feet (3:4 ratio).
The American Standards Association has also defined specific criteria
for the size of lines and lettering used on charts. Refer to these
criteria, if available. A good rule of thumb, however, is to make lines
and letters large enough to be seen and read by all members of the
audience, including those seated at the rear of the room.
CONDUCTING SCHOOL PROGRAMS – GUIDE Using Charts - 27