This is a book about the use of audio-visual materials in teaching -- materials that do not depend primarily upon reading to convey their meaning. It is based upon the principle that all teaching can be greatly improved by the use of such materials because they can help make the learning experience memorable. We have said "all" teaching because audio-visual materials, when used intelligently, can promote the most effective kind of learning, in adults as well as children, in college as well as in grade school -- everywhere. - p. 3.