In this article we report the results of a longitudinal study of an intervention to enhance interdisciplinary team functioning in a primary care setting. Components of the team development intervention are outlined. Team members' assessments of progress towards expressing values consistent with an effective team--as measured through the System for the Multiple Level Observation of Groups (SYMLOG)--are presented and discussed. Institutional, organizational, and team related supports and barriers that affect the development of collaborative, integrated teams are identified and discussed; implications for ensuring teams' success are presented.