This study evaluated the efficacy of Accelerated Reader, a computer-based learning program, at improving student reading. Accelerated Reader is a progress-monitoring, assessment, and practice tool that supports classroom instruction and guides independent reading. Researchers used a randomized controlled trial to evaluate the program with 344 first- through fourth-grade students in three schools in a large Midwestern U.S. city. The results of hierarchical linear modelling analyses indicated that the computer-assisted learning program had a statistically significant positive impact on student reading gains when compared with traditional reading instruction alone. The impact corresponded to a moderate effect size (d = 0.38).