Corner House has adopted the Matrix Model, which is a manual treatment program. It is the only comprehensive treatment program noted by the National Institute of Drug Abuse as a scientifically based approach in Principles of Addiction Treatment: A Research Based Guide (1999). The Matrix Model is described as providing a framework for engaging drug abusers and addicts in treatment and helping them achieve abstinence. Clients learn about issues critical to addiction and relapse, receive direction and support from trained therapists, become familiar with self-help programs, and are monitored for drug use by urine testing. The program also includes education for family members affected by addiction.