Dr. Brittany Cooper is systematically examining the community, organizational, and program factors associated with sustainment in a sample of Strengthening Families Programs (an evidence-based, family-focused, youth substance use and prevention program) implemented under natural conditions as part of a 15-year dissemination effort in Washington State. Using a mixed methods approach, the aims of this study are to: (1) develop and empirically validate quantitative and qualitative measurement tools that can accurately and reliably track sustainability predictors and outcomes in real-world settings, (2) uncover the combinations of factors (i.e., community organizational, program) that distinguish between sites with high and low sustainment success.