Two-year-olds discriminated two original training stimuli nearly perfectly, thereby showing that some form of controlling stimulus-response relation had been established. Most children's generalization gradients had little or no slope. Results are not consistent with earlier generalization data from young children. (RH)

The material presented here is designed to be used as a training program in the preparation, selection, and use of visual aids in instruction. Some prior training in the application of behavioral principles to the preparation of instructional materials is assumed. The program consists of a handbook and a workbook. All the information in the…