This study examined the academic achievement effects of the privately managed network of charter schools, Advantage Schools. Advantage Schools employ Direct Instruction curricula across subjects, emphasize accountability for student achievement, have an extended school day and year, and implement a behavior system that focuses on positive reinforcement. Results from the SAT-9 and Woodcock Reading Mastery Test-Revised (WRMT-R) indicate that on average, students learned at an accelerated rate in the 1999-2000 school year, with students in K-2nd grade demonstrating the greatest gains. (Copyright © 2011, National Institute for Direct Instruction (NIFDI). All rights reserved).