The major emphasis of the National Longitudinal Study of the High School Class of 1972 (NLS) has been directed toward individuals in the 1972 high school graduating class. Consequently, sampling parameters were established to ensure student representation, and the bulk of data collected were individual-level data. School-level data exist on a separately documented database, and weights appropriate for analyzing these data have been computed. The purpose of this report is to define the post-stratification adjustment procedure used to develop appropriate school-level weights, given an initial school selection procedure designed to provide student representation. This report describes the NLS school sample design, computation of unadjusted student weights (used in determining weights for individual high school seniors), and computation of adjusted weights for school-level analyses. (Author/BW)