This paper proposes a multi-level, four-phase model of the implementation process of evidence-based practices (EBPs) in public service sectors, focusing on child welfare and specialty mental health services. The phases are Exploration, Adoption/Preparation, Implementation, and Sustainment. The authors highlight key features of each phase and consider the outer and inner contexts of public sector service systems. The outer context includes sociopolitical/funding, client advocacy, and interorganizational networks, while the inner context involves organizational characteristics, individual adopter characteristics, and leadership. The paper emphasizes the importance of aligning with community stakeholders, developing partnerships, and fostering a receptive organizational climate to facilitate effective EBP implementation.This paper proposes a multi-level, four-phase model of the implementation process of evidence-based practices (EBPs) in public service sectors, focusing on child welfare and specialty mental health services. The phases are Exploration, Adoption/Preparation, Implementation, and Sustainment. The authors highlight key features of each phase and consider the outer and inner contexts of public sector service systems. The outer context includes sociopolitical/funding, client advocacy, and interorganizational networks, while the inner context involves organizational characteristics, individual adopter characteristics, and leadership. The paper emphasizes the importance of aligning with community stakeholders, developing partnerships, and fostering a receptive organizational climate to facilitate effective EBP implementation.