The "psychological isotope" technique was used to study the effect of leadership style on group process and productivity, by planting identifiable units of information with specific group members. Data indicated that the movement of these traceable bits provides data on the flow of information in the group, the relative influence and impact of specific group members, and the sources of conflict. Strong and reliable results identified the effects of leadership style on group process and the positive and negative effects of interpersonal conflict. (Author)