The State Capacity Assessment (SCA) was developed to assess the impact and presence of efforts to build strong foundations needed to adopt, sustain, and scale effective practices so that they lead to positive outcomes. In use, the SCA assesses the extent to which an agency invests in and aligns system components to support use of best practices, which includes support and development of implementation teams within and across all levels of the system. In other health and human services fields, this State Capacity Assessment is referred to as the Agency Capacity Assessment (ACA). This document addresses: (1) the administration process and key roles; (2) focus of the SCA-ACA and scoring; (3) preparation for the assessment; (4) research basis; and (5) next steps after administration.