Describes study of high school students that was designed to determine the relative effectiveness of color, graphics, and animation in computer assisted learning (CAL) of a mathematical rule. Three CAL modes, in color and in black and white, are compared; pretests and posttests are explained; and further research needs are suggested. (13…

Discussion of the use of nonexamples as an effective strategy in teaching concepts focuses on a study of college students that explored the use of common errors to teach the procedure for color correction of color transparencies. Treatments for the experimental and control groups are described, and further research needs are indicated. (Author/LRW)