The National Longitudinal Transition Study-2 (NLTS2) is a study that is part of the National Longitudinal Transition Study (NLTS) program; program data is available since 2000 at https://ies.ed.gov/ncser/pubs/index.asp#nlts2. NLTS2 (https://ies.ed.gov/ncser/projects/nlts2) is a longitudinal survey that was designed to provide a national picture of the experiences and achievements of students in special education during high school and as they transition from high school to adult life. NLTS2 involved five waves of data collection using three main data collection components: (1) telephone interviews with parents and youth who are capable of completing a phone interview; (2) direct assessments and in-person interviews with youth while they are in secondary school; and (3) the collection of school data (e.g., surveys of teachers, special education teachers, principals). A nationally representative sample of students who were 13 to 16 years old and receiving special education services in December 2000 when the study began were sampled, and these students were followed until 2010. Key statistics produced from NLTS2 are characteristics of secondary school students in special education and their households; secondary school experiences of students in special education, including their schools, school programs, related services, and extracurricular activities; experiences of students once they leave secondary school, including adult programs and services, social activities, etc.; and measurement of the secondary school and postschool outcomes of students in the education, employment, social, and residential domains.