PEELS is a study that is part of the Pre-Elementary Education Longitudinal Study. PEELS (https://ies.ed.gov/ncser/projects/peels/) is a longitudinal survey that is designed to describe the characteristics of children receiving preschool special education, their educational programs and services, and their transitions from preschool programs to elementary schools. The study was conducted using CATI, paper questionnaires, and child assessments. The study followed a nationally representative sample of children with disabilities who were 3 to 5 years old at the start of the study in 2003 through 2009, examining the achievement of students with disabilities in preschool, kindergarten, and elementary school and determining the factors associated with this achievement. 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.