The chapter describes the application of Positive Behavior Support in the diverse settings that serve young children through the implementation of the Pyramid Model framework. The Pyramid Model provides a multi-tiered framework of practices to promote the social-emotional development of all children, prevent the development of problem behavior, and intervene with children who have persistent challenging behavior. The chapter details strategies for program-wide implementation, including leadership teaming, staff buy-in, family engagement, professional development, and data-informed decision-making. The authors present research findings of the effectiveness of the implementation of the Pyramid Model and describe future directions for scaling and sustaining equitable implementation across early childhood settings.