NREPP is a voluntary rating and classification system for mental health and substance abuse prevention and treatment interventions - a system designed to categorize and disseminate information about programs and practices that meet established evidentiary criteria. NREPP began in 1998 as the National Registry of Effective Prevention Programs within the Center for Substance Abuse Prevention (CSAP). Beginning in 2004, SAMHSA began expanding the NREPP to include reviews of interventions in other SAMHSA domains of substance abuse treatment, and mental health promotion and treatment. SAMHSA will launch the expanded NREPP by March 2007. The NREPP will feature a new web site that emphasizes comprehensive, transparent, and searchable information - as well as ratings - on an array of interventions to prevent and/or treat mental and substance use disorders.