This study investigated the effectiveness of a group dynamics workshop held January 26-28, 1970, at Nashville, Tennessee, for 16 professional public health workers. It covered individual psychology, types of groups and their objectives, leadership styles, questioning techniques, and situations dealing with individuals. The 20 point Kropp-Verner Evaluation Scale was used, together with a questionnaire designed to obtain background data and participant evaluations (on a five point scale) of specific program elements. Participants were about evenly divided by age (over or under 35) and sex; most had at least a bachelor's degree; and most were employed at the local or regional, rather than the district or state, level. Over half were health educators, and most had had more than ten years' experience in public health. The instructor received a mean rating of 4.07 (quite effective), Similarly, evaluations of all program topics but one (questioning) were strongly positive. It appears that the questioning segment needs strengthening for future workshops. (LY)