The quality of research on groups has been notoriously poor. This article is an attempt to respond to the research and evaluation deficit by providing some methodological approaches that might encourage group researchers and practitioners to attempt high quality research. (Author)

Determined the outcomes of a semester-long encounter group using multiple measures, a sensitive experimental design, tight experimental controls, and an equivalent control group. Only one subscale of the Tennessee Self-Concept Scale and four subscales of the Personal Orientation-Inventory showed a significant difference between experimental and…