2007-08 Schools and Staffing Survey (SASS) and 2008-09 Teacher Follow-up Survey (TFS) Restricted-Use Data with Codebook

SASS used a stratified probability sample design to ensure that the samples of schools, principals, teachers, districts, and school library media centers contained sufficient numbers for reliable estimates. Public and private schools were oversampled into groups based on certain characteristics. After schools were stratified and sampled, teachers within the schools were also stratified and sampled based on their characteristics.