Children with externalizing behavior problems (EBPs), characterized by aggression, hyperactivity, inattention, and oppositionality, do not experience the same academic and behavioral benefits from Head Start as their peers, and are at risk for a host of negative outcomes later in life. The current mixed method study, rooted in an implementation science framework, aims to take the first step towards achieving an ultimate goal of developing a method for Head Start workforce enhancement that is effective in helping children with EBPs while being acceptable, feasible, and sustainable for the Head Start workforce. Through three phases of data collection including surveys (Phase I) and focus groups (Phase II) with all Head Start personnel, as well as observations of children with EBPs (Phase III), the project seeks to comprehensively understand the current practices for children with EBPs in Head Start, assess acceptability and feasibility of effective strategies for children with EBPs, and identify areas for sustainable workforce enhancement in a large culturally and linguistically diverse urban community.