Accelerated Reader is a progress-monitoring system that provides feedback on the comprehension of books and other materials that students have read. It also tracks student reading over time. Currently, more than 180,000 different Accelerated Reader quizzes have been developed and are in use. This report provides reliability and validity data for Accelerated Reader quizzes. The reliability analyses use a large database of nearly 1 million quiz records. Validity is established through correlations with scores from 24 standardized reading tests and through a study that confirms that the quizzes are effective at discriminating between instances of students having read the book versus not having read the book. The report also includes descriptions of the purpose and intended classroom use of Accelerated Reader, descriptions of the types of quizzes, and the processes for quiz development. The report is available online: <https://docs.renaissance.com/R35806>.

DETAILS: School Profile: 687 students in grades pre-K-6; Demographics: Rural, Free/reduced Lunch: 12%; Race/Ethnicity: Hispanic or Latino: 0.6%, Black or African American: 1.6%, Asian or Pacific Islander: 0.1%, White: 97.1%, American Indian or Alaska Native: 0.6%. RESULTS: After adopting Accelerated Reader with best practices, the number of 4th-grade students demonstrating proficiency in reading on the Massachusetts Comprehensive Assessment System (MCAS) test increased 37 points in just 1 year. REPORTING EDUCATOR: Virginia Cutler, Title I director and reading specialist. (Email research@renaissance.com to request a copy of this study from the Renaissance Research Department.)