Three agency teams at an ARC sheltered workshop providing comprehensive services to individuals with developmental disabilities and their families were surveyed about the dynamics of the team process and then received inservice training on the team process and on evaluating teams. The inservice training included lecture, discussion, role play, and exercises. It addressed: definition, benefits, and myths of teams; requirements of teamwork; barriers and problems of teamwork; and communication and decision making techniques. Training on the teamwork evaluation process addressed the Factors Model and use of a team evaluation form. All three teams showed significant improvement in their functioning. The paper concludes that interdisciplinary teamwork is an integral component of agency practice and is not adequately presented in preservice education or agency inservice programs, and that all levels of staff, from direct care to top management, can benefit from teamwork training. Various handouts are appended. (Contains 24 references.) (JDD)