Significant desired changes occurred in the conference behavior of a group of supervisor-trainees who participated in a microteaching practicum. There was also a significant shift in the way the group evaluated teaching skills; at the end of the practicum their ratings more closely approximated those assigned by a group of experienced supervisors. The fact that significant phenomena were predicted and measured is evidence that the microteaching procedure provides a workable framework for the study of supervisor behavior and its consequences. Additional research is needed to assess other possible effects such as changes in non-verbal conference behavior. (Author/MF)