The extent to which integration of behavioral health services improves the institution of primary care rests upon the ability of the members of the new team to work cooperatively in pursuit of common goals. This chapter describes fundamental competencies for all members of the team to understand and apply in daily work activities. It offers a new Core Competency Tool, one for team members and PCPs. The tool describes behavioral anchors and provides examples to illustrate the skills needed to support new ways of interacting with patients, with the new PCBH staff member(s), and with each other. Every member of the team is important, so this chapter discusses how everyone on the team can re-shape practice habits in small or large ways and experiment with new skills in order to optimize teamwork and better serve patients. The full-length Team and PCP Core Competency Tool introduced in this chapter is available in the body of this chapter and on the book website (http://behavioralconsultationandprimarycare.com).