This article is introduced by historical references to Freud's Wednesday Evening Society and to relevant sources in the literature on group supervision. The aims of group supervision are defined: helping supervisees to understand the individuals who comprise their groups, helping the supervisee become a group-oriented therapist, alerting supervisees to the critical task of monitoring and regulating the amount of emotional excitation within their groups, helping supervisees deal with the range of feeling induced in them by their groups, and helping them become familiar with the principles and become proficient in the techniques of modern analysis. Major aspects of the group-supervisory process are delineated and illustrated through the use of vignettes. Resistance in supervisory groups is discussed with examples of the resolution of some resistances. The author's method and style of leading supervisory groups are presented as are observations on the boundaries of supervisory groups.