The National Longitudinal Transition Study (NLTS) of Special Education Students provides ongoing information to the special education community regarding the transition of youth with disabilities from secondary school to early adulthood. The sample for the study, which began with a 1987 survey (Wave 1), involves more than 8,000 youth from the national population of special education students who were at least 13 years old in the 1985-86 school year. These subjects were again surveyed in 1990-91 (Wave 2). This report documents the data collection and data processing procedures for Wave 2 of the NLTS. Data collection components for Wave 2 included parent/youth telephone interview and mail questionnaires (n=6,684) as well as school transcripts and surveys (n=4,057). Tables provide details of the data collection and preparation activities. The bulk of the document consists of appendices. These include information on Wave 1 substudies, the parent/youth interview instrument, the parent and youth mail questionnaires, and the school based data collection instruments. (DB)