Southern Regional Education Board's (SREB's) "High Schools That Work" ("HSTW") initiative works with more than 1,100 schools in 30 states and the District of Columbia to improve school and classroom practices and prepare more students for success in postsecondary studies, training and careers. This brief report analyzes student achievement at 32 Tennessee "High Schools That Work" ("HSTW) sites, with particular attention to differences in achievement related to schools' level of implementation of the "HSTW" design. (Contains 5 tables and 3 footnotes.)