Nine 16-17-year-old adjudicated males below grade level in reading participated in this data-based case study. Weekly, 5 students received instruction from "Corrective Reading Decoding" Level B2 (Engelmann et al., 1998) for 180 min, and 4 students received instruction designed by a reading specialist (RS group) for 345 min. After 19 weeks, standardized change scores for the Woodcock Reading Mastery Test-Revised (WRMT-R; Woodcock, 1998) revealed 60% of the "Corrective Reading" participant subtest scores showed moderate to large gains. In contrast, none of the RS participants made gains, and the majority (57%) showed moderate to large losses. Composite scores revealed that 73% of the "Corrective Reading" group scores showed moderate to large gains, and 27% showed zero to no change. In contrast, no RS participants had scores that showed gains, and the majority (75%) showed composite scores with moderate to large losses. (Contains 3 tables.)