Health professionals’ mental models of patients’ needs and illness processes are crucial in shaping healthcare and patient outcomes. These mental models consist of internal representations of diseases, symptoms, and patient behaviors, as well as the expectations interaction with other health professionals which clinicians use to diagnose, treat, and communicate with patients. Mental models interact reciprocally with the routines of practice and the structure of roles in a healthcare organization. Trying to initiate the change in routines of practice and in the structure of roles that integrating behavioral health into an organization represents, without taking the mental models of the team members into account, can lead to unexplainable barriers to progress in integration. This presentation will give participants a chance to look at the way the mental models of team members in their settings affect and are affected by the efforts toward integration they have experienced.