The purpose, design, and key findings of the Schools and Staffing Survey (SASS) are discussed. The SASS is a triennial set of unified surveys conducted by the National Center for Education Statistics. In conjunction with a teacher follow-up survey, the SASS profiles the nation's elementary school and secondary school teaching force and analyzes questions of teacher supply and demand. The four separate surveys are: (1) the Teacher Demand and Shortage Survey; (2) the School Administrator Survey; (3) the School Survey; and (4) the Teacher Survey. Each SASS questionnaire contains a core that is a stable set of items and a module of additional items that can vary for each administration of the SASS. Key results from the 1987-88 SASS and the Teacher Follow-Up are available, allowing policymakers and planners to follow selected trends in teacher supply and demand and teacher characteristics from 1987-88 through 1990-91. Selected trends in school and staffing include the following: demographic characteristics of the teacher workforce remained stable between 1987-88 and 1990-91; a higher percentage of teachers in 1991 than in 1988 reported that they plan to stay in teaching as long as they are able; and in 1991 fewer secondary school teachers viewed alcohol and drug abuse by students as serious problems in their schools when compared with 1988. (SLD)