“…Finally, in prevention studies that do measure program implementation, greater fidelity is consistently associated with better outcomes across a diverse set of prevention models such as social skills training~Botvin, Baker, Dusenberry, Tortu, & Botvin, 1990;Kam, Greenberg, & Walls, 2003!, coordinated community-based prevention~Pentz et al, 1990!, and classroom ecology intervention~Harachi, Abbott, Catalano, Haggerty, & Fleming, 1999 Ideally, fidelity research helps to establish the internal validity of intervention studies, allowing investigators to attribute study effects directly to the interventions themselves~Carroll et al, 1994!. The most rigorous kind of fidelity research is fidelity process analysis, a subcategory of intervention process research~Tolan, Hanish, McKay, & Dickey, 2002! that investigates how the core, change-promoting elements of a given model are delivered, with the aim of understanding successes and failures in model application as well as the pragmatics of implementation with various populations Hogue, Liddle, & Rowe, 1996!.…”