Studies conducted by the What Works Clearinghouse (WWC) have found that the Accelerated Reader (AR) tests have no discernible effects of reading comprehension skills. The AR program is designed to improve reading skills by testing students on literary content using computerized quizzes that track academic progress.
The What Works Clearinghouse review of the AR test consisted of studies that examined student outcomes in comprehension based on performance in reading and vocabulary development. These comprehension outcomes displayed effects that the WWC criteria did not determine to be statistically significant. Other educational aspects covered by the review included alphabetics, reading fluency and general literary achievement.