This is a guide for implementing widespread use of evidence-based practices for improving the outcomes for young children with or at-risk for delays or disabilities and their families. The evidence-based practices are selected practices from the Division for Early Childhood (DEC) Recommended Practices (RPs). The guide is written for statewide systems change, although it could be used for regions within a state or even for a large metropolitan area, as long as the administrative authority enables the necessary policy statements and resource allocations. It is intended to be used by a cross-agency team whose purpose is to provide resources, guidance, and coordination for the systems-change effort. It can be used to support states in developing, planning, and implementing the State Systemic Improvement Plan (SSIP).