This user's manual has been produced to familiarize data users with the procedures followed for data collection and processing of the first follow-up teacher component of the National Education Longitudinal Study of 1988 (NELS:88). The teacher component provides teacher information that can be used to analyze the behaviors and outcomes of the student sample. Another objective is to provide the documentation necessary to use the data files. Chapter 1 presents the history and an overview of the NELS:88 program. Chapter 2 contains a general description of the data collection instruments of the first follow-up study. The sample design and weighting procedures of the first follow-up are documented in chapter 3; and data collection procedures, schedules, and results are presented in chapter 4. Chapter 5 describes data preparation and processing. Chapter 6 describes the organization and contents of the data file and provides important suggestions for using it. The seven appendixes contain a list of other publications, guidelines for Statistical Analysis System (SAS) users, the first follow-up teacher questionnaires, and the record layout for the questionnaire. A codebook for the data is the final section of the manual. (SLD)