This training module explains the service model features that are foundational for Assertive Community Treatment (ACT) teams to adopt in the initial stages of ACT/FACT implementation. The session describes the key structural and clinical elements of ACT that are essential to put in place early in the implementation process as teams move toward delivering the full ACT model in accordance with evidence-based guidelines. It also describes the processes and resources that will be used by California's ACT/FACT Center of Excellence, the Public Mental Health Partnership at UCLA, to support counties in building and sustaining effective ACT/FACT teams.