This manual was produced to familiarize data users with the procedures followed for data collection and processing of the second follow-up teacher component of the National Education Longitudinal Study of 1988 (NELS:88) and to provide the necessary documentation for use of the data file. The NELS:88 teacher component was designed to provide teacher information that could be used to analyze the behaviors and outcomes of the student sample. The teacher survey instrument was administered to one mathematics or science teacher of second follow-up sample members enrolled in mathematics or science in a NELS:88 sampled school. It collected teacher evaluations of student characteristics, and performance and curricular information. Parts 1, 2, 3, and 4 contain an overview of the study, descriptions of data collection instruments and processes, and a review of sample design and weighting. Parts 5 and 6 describe data control, preparation, and processing. Chapter 7, and Appendix D, contain the information necessary to use the file. In all, there are 10 appendixes with supplemental information. Fourteen tables and 12 figures present some study data. (SLD)