This paper describes materials designed for classroom projects on stimulus generalization and peak shift. A computer program (originally written in QuickBASIC) is used for data collection and a Microsoft Excel file with macros organizes the raw data on a spreadsheet and creates generalization gradients. The program is designed for use with human participants. The stimuli produced by the program are horizontal lines of varying length. It is possible to manipulate the variables examined in some past experiments, such as the effect of S+, S- similarity on the degree of peak shift (cf. Hanson, 1959). The user determines whether simple generalization training or discrimination training will be used, and the specific line lengths appearing in each phase of the procedure. (Contains 2 figures.)