Theories and research in speech communication that have particular relevance to organization development include studies in areas of entropy, feedback, group cohesiveness, norms, opinion leadership, and source credibility. One study of an organization development project made at a hospital revealed that subjects tended to report those changes in management practices designed to improve interpersonal processes. A primary weakness in the program appeared to be the lack of systematic reinforcement of newly learned behaviors. This observation suggests procedures whereby future organization development programs can be improved. Also, those who plan such programs, especially for organizations such as hospitals, should focus on small units within the overall group. (RN)