The PEELS followed almost 3,000 children with disabilities as they progressed through preschool and into their early elementary years. Data were collected on the preschool and early elementary school experiences of a nationally representative sample of children with disabilities and the outcomes they achieved and included children’s preschool environments and experiences, their transition to kindergarten, their kindergarten and early elementary education experiences, and their academic and adaptive skills. Key statistics produced from PEELS are characteristics of children and their families; characteristics of educational services and providers; transitions from early intervention to preschool, and preschool to elementary school; and school-related readiness and behavior. The children were 3 to 5 years old at the start of the study in 2003 and were followed through 2008.