Findings from a recently completed NIMH-funded R01 trial, "Family Groups for Urban Youth with Disruptive Behavior" (R01 MH R01072649; PI: McKay), reveal that MFGs are associated with significant improvements relative to standard care (SC) in: 1) rates of family engagement and retention (80% completed); 2) short- (16 weeks) and long-term (10 months) improvements in child conduct problems and impairment; and 3) improvements in parenting and family processes. Although promising, this earlier study did not systematically examine specific mechanisms of family-level change hypothesized to influence child behavior.