Assertive Community Treatment (ACT) is an evidence-based practice that employs a "shared caseload" team-approach designed to provide comprehensive, community-based psychiatric treatment, rehabilitation, and support to persons with serious and persistent mental illness. ACT has been extensively researched and evaluated and has proven clinical and cost effectiveness. Among the services ACT teams provide are 24-hour on call; crisis services; case management; psychosocial rehabilitation; supported employment and permanent supportive housing services; family support and education; substance abuse services; and other services and supports critical to an individual's ability to live successfully in the community.