This continuation study evaluates the long-term outcomes of multimodal, modular interventions with early-onset behavior disordered children and innovative methods to promote the maintenance and extension of treatment effects relating to ODD and CD. All participants originally enrolled in the "parent" clinical trial are being followed and those who initially received clinic or community based intervention from a study clinician were randomly assigned to either Booster or No-booster treatment condition. The treatment-as-usual (TAU) and Healthy Control participants were also followed through long-term follow-up assessments paralleling clinically referred participants. The study examines the short and long-term efficacy of booster treatment on clinical outcome, contextual variables, and service satisfaction/use.