The Matrix Model is an intensive outpatient substance abuse treatment approach designed for treating individuals who abuse or who are dependent on stimulant drugs, such as cocaine or methamphetamine. This treatment model, developed in 1986 by the Matrix Institute of Los Angeles, California, came about out of a growing need for evidence-based practices in the treatment of stimulant disorders. The Matrix Institute is a nonprofit organization established in 1984. Its purpose is to disseminate empirically based information to treatment professionals in order to improve the quality of treatment for substance use disorders. Staff from the Matrix Institute developed the Matrix Model through the assimilation of numerous empirically tested treatment approaches. The Matrix Model includes elements of cognitive behavioral therapy, relapse prevention, psychoeducation, family therapy, and ...