In Stage 1, 20 substance abuse treatment (SAT) professionals, including clinicians, supervisors, and administrators, will participate in clinical focus groups. Clinical focus group members will review and discuss the MMI, its potential uses, and specific strategies around its implementation. Also in Stage 1, 240 clients will participate in a formal psychometric evaluation study of the Multidimensional Monitoring Instrument (MMI). These participants will complete a study intake meeting, which will include providing locator information (to facilitate scheduling research appointments), a baseline ASI6, and the MMI. After this intake, participants will complete 5 additional MMIs during a 4-week period. At the one and two-month follow-up research meetings, participants will complete the ASI6 and provide specimens for urine drug screens (UDSs). To ensure adequate resource management, participants who leave treatment at the program will not be continued in the study. Participants who are incarcerated during the study will not be contacted while in custody.