Overcoming drug addiction requires great personal motivation on the part of the addict: the drug abuser must want to break the habit before change may occur. Contingency management interventions represent one of the most effective ways to enhance motivation among substance abusers. This work describes the use of contingency management with individuals addicted to cocaine, heroine and other illicit drugs. Contingency management is a scientifically-based process of providing incentives for abstaining from drug abuse. Techniques involved in this treatment include positive reinforcement for drug abstinence and punishment for returning to drug use, with the emphasis on positive reinforcement. This book reviews literature describing the use of contingency management techniques with a wide range of individuals, including pregnant women, homeless people, and schizophrenic drug abusers. This detailed, comprehensive volume should be of value to researchers, clinicians and policy makers alike.