Enhanced interest in supervision training has corresponded with recognition of supervision as a profession in its own right. For many practicing professional counselors, supervision training has traditionally been unavailable. The present research used the Clinical Supervision Questionnaire to evaluate the effect of a supervision training program on the supervision scores of 16 practicing professional counselors who participated in a supervision training program. Participants completed a pretraining and posttraining questionnaire. The findings revealed a significant difference between the pre- and posttraining results for the experimental group. This difference was maintained over a 6-month period. Practical and research implications are discussed.