After a brief historical look at personal growth groups, this paper traces the steps involved in the development and evaluation of simulation materials which were designed to aid the group leader's understanding of his affect in the member/leader relationship. It examines the concept of this specific relationship in personal growth groups. Groups are discussed in terms of the following issues which typically surface in the member/leader relationship: dependency, competence/trust, hostility, sexuality and separation. Particular consideration is given to the role of the leader and to the current status of training group leaders regarding these issues. Also included is a description of author-created simulation materials. A discussion of the field trial of these materials shows that simulations can be a valuable training tool for group leaders. Finally, suggestions for further study are made. (Author/KRP)