This first of two social work studies with developmentally disabled adults evaluates the effectiveness of a social skills training package in a replication of Bales (1980). Two groups of four trainees from vocational training programs were organized at two sites, respectively (n = 8). Both groups received a 12-session training package designed to improve social skills in four domains. A multiple baseline design across skills was used to evaluate effectiveness for individuals in each group, with skills assessed using a 16-situation role-play test. As a result of training, participants improved in skill performance using the role-play test, but an in-vivo assessment showed little change. Thus it was concluded that the treatment package was effective in improving social skills, but not powerful enough to effect significant changes in other settings. Suggestions are given concerning treatment effectiveness and implications for social work practice.
