PROJECT SUMMARY/ABSTRACT Autism spectrum disorder (ASD) is a lifelong neurodevelopmental disability that affects 1 in 54 children in the United States. Many evidence-based interventions have been developed that improve child outcomes for children with ASD. Yet there is a 17-year research-to-practice gap in which evidence-based practices (EBPs) developed in laboratory settings finally reach community settings. Consultation models are typically comprised of multiple components, which may differentially influence provider behavior. This single-case experimental design will experimentally manipulate three potential active ingredients of a consultation model (feedback on taped sessions, case support, and skill rehearsal) in 4 applied behavior analysis (ABA) agencies in order to identify potential active ingredients of the consultation model. Consultation will focus on telehealth delivery of an empirically supported manualized parent-mediated intervention for children with ASD (Project ImPACT). Groups of 3-5 providers will be recruited from 4 agencies (N = ~20 providers in total) that contract with regional community mental health agencies within the Michigan Medicaid Autism Benefit, which provides applied behavior analysis services to Medicaid-enrolled youth with ASD. Providers will complete a self-directed online tutorial on Project ImPACT. Each provider will enroll at least one caregiver on their caseload who has a child enrolled in the Michigan Medicaid Autism Benefit (N = ~20 caregivers). Next, each agency will be randomly assigned to a) the length of the baseline period (between 3-6 weeks) and b) the order that they will receive the consultation components. Providers will record one session per week with their enrolled family and submit it via a HIPAA compliant Dropbox link. They will also complete weekly online questionnaires on implementation outcomes. Implementation outcomes will be assessed via observational coding of weekly sessions for treatment adherence and competence, and analysis of weekly provider questionnaires regarding case penetration, and feasibility, acceptability, and appropriateness of Project ImPACT and each of the 3 consultation phases. Providers will submit a final recorded session and questionnaire 8-weeks post- consultation. Caregivers will complete a measure of social communication for their child via online questionnaire at baseline, twice during consultation, and after 8 weeks post-consultation. Data analysis includes multilevel modeling and visual analysis. Results will identify active ingredients of the consultation model which will later be used to develop a causal model of the mechanism by which consultation improves implementation outcomes. The training plan consists of mentorship, courses, workshops, and experiential learning and will develop expertise in efficacy and implementation research within the autism field.