The Office of Special Education Programs (OSEP) of the U.S. Department of Education is working to provide the information needed to improve the transition and postschool outcomes of secondary school students with disabilities, in part through the National Longitudinal Transition Study-2 (NLTS2). The findings of this 10-year study generalize to youth with disabilities nationally and to youth in each of the 12 federal special education disability categories in use for students in the NLTS2 age range. This report examines efforts to prepare youth with disabilities for the transition from secondary school to adulthood. It highlights the transition planning process undertaken during high school with and for youth with disabilities as they prepare for life after school. These topics are addressed by using data from two important sources: (1) Parents or guardians of NLTS2 study members; and (2) School staff best able to describe students' overall programs. From these data, NLTS2 provides a national picture of transition planning, including variations in that planning for students who differ in disability and other characteristics. The following are appended: (1) NLTS2 Sampling, Data Collection, and Analysis Procedures; (2) Demographic Characteristics of Youth with Disabilities and Their Households; and (3) Unweighted Sample Sizes. (Contains 33 exhibits and 15 footnotes.)