Outlining essential steps and legal requirements for transitioning young children with disabilities from early intervention services to preschool special education, this resource supports educators and service providers with clear guidance on timelines, roles, and collaborative practices. It emphasizes the importance of interagency coordination to ensure that children eligible for special education have an individualized education program (IEP) in place by their third birthday, as mandated by federal law. The guide also includes practical tools and references to help professionals navigate the transition process effectively while centering the needs of children and families.