Data were collected pre- and post-intervention on group member characteristics, attitudes about the importance of integrating services, and perceptions of aspects of group process.; Overall, the study found that group model building made a positive difference in participants' perceptions of their alignment with their group members. Analyses of objective measures, however, failed to demonstrate significantly greater alignment for group model building participants. Group model building also made a positive difference in participants' perceptions of their understanding of the problem situation.; Implications for group model building researchers include the need for a better understanding of what group model building components made a difference and an identified need for clarifying alignment as a re searchable construct. Implications involving alignment include the need for serious examination of its role in outcomes of system thinking interventions and consideration of ramifications for measurement and analytic approaches.