In recent years, facilitated systems dynamics group model building has been used to facilitate and support decision making in management teams working to solve complex problems in both private and public sector setting. This approach is considered to be an important tool for improving the systems thinking and decision making capabilities of participating managers. The goal of these interventions is to strengthen a teams' ability to work towards developing an agreed upon course of action that will ultimately lead to resolving the problems at hand. Although there are strong indications that these approaches provide great benefit, little research has empirically explored the degree to which group system dynamic model building successfully facilitates this outcome. In New York State, a system dynamics group model building strategy is being systematically examined as an approach to promote public sector system change in mental health and vocational rehabilitation service to promote public sector system change in mental health and vocational rehabilitation service delivery systems.