A pre- and postexperimental design with a control group was used to evaluate the effectiveness of a management development program. Subjects were 48 first line staff supervisors employed by a major manufacturing company. The training group subjects (n = 24) attended the company's 1-week training program. Subjects in the control group (n= 24) were similar with respect to plant location, job assignment, etc. A 42-item employee-opinion questionnaire was constructed to measure supervisory style and work.-group climate. The subjects' subordinates (n = 313) completed the questionnaire before and after training. Eleven items identified by content analysis as most relevant to the training content comprised the measure of training effectiveness. An analysis of covariance was performed using the pretest as the covariate. Results indicated no significant training effects.