Transitioning to school and between educational settings is a significant milestone for children and families. Successful transitions lead to better outcomes for children and enhance continuity of learning and development. This evidence summary supports the practice guide from Australian Education Research Organisation (AERO), "Transitions to School for Children with Disability or Developmental Delay." It describes the evidence base behind the guide, synthesising insights from available research to connect to policy and practice. This evidence summary is derived from a systematic review conducted with AERO's partners at Monash University in May 2022 using the Preferred Reporting Items of Systematic Review and Meta-Analyses (PRISMA) guidelines.