A descriptive examination of: (1) the structure & content of provider network agreements between managed care organizations (MCOs) & community mental health & substance abuse (MH/SA) treatment & prevention agencies, proving an assessment of provider contracts to identify the meaning of these instruments for MH/SA service providers, group purchasers, MCOs, individual consumers, & public policy makers; & 2) service agreements between State Medicaid agencies & MCOs for mental health & substance abuse treatment services, addressing enrollment, benefits & services, duties, & quality assurance.