This documentation was prepared to facilitate use of the National Longitudinal Study (NLS) school file prepared from information collected, processed, and systematically stored for the National Longitudinal Study of the High School Class of 1972, conducted under contract to the National Center for Education Statistics, Office of the Assistant Secretary for Educational Research and Improvement, U.S. Department of Education. The NLS school file is a companion file to the NLS student-based data file. The school file is composed of 1,318 school records, one record for each high school from which NLS students were sampled. This file contains information about the environment, staff, procedures, facilities and curricula of the NLS sample high schools. The 504 variables that make up the file are primarily from the School Questionnaire and/or one or two Counselor Questionnaires for each of the 1,318 participating schools. The sample design for the NLS is a stratified, two-stage probability sample of students from all schools, public and private, in the 50 states and the District of Columbia, which contained twelfth graders during the 1971-72 school year. The study excluded students from schools for the physically or mentally handicapped, schools for legally confined students, and special school situations (such as area vocational schools) where students were also enrolled in other high schools in the sampling frame. [This report was prepared by the Center for Educational Research and Evaluation at the Research Triangle Institute.]