There exists widespread concern among the public about the quality of care provided to children with autism spectrum disorders (ASD) in community mental health (CMH) services as therapists often lack specialized training to address the complex needs of children with ASD, particularly behavior problems, and do not use evidence based practices (EBPs) consistently or intensively. Researchers propose a modified EBP strategy based on the clinical needs of children and training needs of therapists termed, "An Individualized Mental Health Intervention for Children with ASD,” or AIM HI. AIM HI is a package of EBP strategies, based on the principles of applied behavior analysis, designed to reduce challenging behaviors in children with ASD ages 5 to 13 served in CMH clinics. In this study, investigators will conduct a randomized controlled trial of AIM HI in 29 clinics to test its impact on child and family outcomes and determine how child/ family characteristics and level of therapist fidelity moderate treatment effects. Researchers will also identify barriers and facilitators of AIM HI implementation (e.g., intervention, organization, provider characteristics).