A multiple family group (MFG) is a family-centered, group delivered, evidence-informed, manualized intervention that targets the most common reason for referral to publicly funded clinics: youth oppositional defiant and conduct disorders.5,6 MFGs target family factors which have been consistently implicated in the onset and maintenance of childhood behavioral disorders.7-9 and integrate components of existing evidence-based practices (EBPs). The MFG service delivery model was developed in collaboration with urban parents and service providers to address the serious challenges associated with EBP roll-outs: low rates of family involvement; poor uptake by providers; clinic and provider impediments to maintaining fidelity; and attenuated child outcome effects. These obstacles are pervasively associated with living and providing care within poverty-impacted communities and resource scarce, urban child behavioral health systems.