3This book describes Screening, Brief Intervention, and Referral to Treatment (SBIRT) for substance use, a comprehensive, integrated, public health approach to the delivery of services for persons engaging in risky substance use and those with alcohol and other substance use disorders and co-occurring mental health disorders. Chapters illustrate how the SBIRT approach is used in diverse healthcare settings and populations, and highlight opportunities for psychologists to use SBIRT to engage patients and clients in conversations about substance use.