This document discusses implementing a sequential process of screening, brief intervention, and referral to treatment for early identification and treatment of substance use issues among homeless individuals living in shelters. It involves using the ASSIST screening tool during intake to screen for alcohol and illicit drug use, providing a brief intervention for moderate to high scorers, and referring those with moderate to heavy use to treatment. The goals are to change current screening processes, identify billing opportunities, and facilitate early identification and treatment through a patient-centered care approach.