In an experiment to test the effectiveness of discrimination training--contrasting good and poor teacher behaviors and demonstrating the stimulus occasions for these behaviors--as compared with feedback from an instructor in microteaching, a discrimination model for a limited class of teaching behaviors was devised and subjects were divided into three groups according to the type of training received. The first group received discrimination training, practice, and feedback (DPF); the second group received discrimination training and practice (DP); and the third group received practice and feedback (PF). A comparison of pre- and posttest scores on several behavior rating scales showed consistent and significant improvement of the DPF and DP groups as compared with slight improvement in the PF group. These results seem to indicate that discrimination training could replace feedback from an instructor in many cases and thus effect substantial economies in teacher education. (An appendix contains pretest posttest comparison graphs) (RT)