Sixteen schools, 46 teachers and 1,012 students in four suburban and city districts across the US implemented participated in a 2015 third-party evaluation of the effectiveness of Achieve3000’s solutions using randomized controlled trials. Overall, the learning gains of treatment students who used Achieve3000 were statistically significant and substantively important—based on the What Works Clearinghouse threshold of .25—for all areas assessed: the GMRT-4 Vocabulary, Reading Comprehension, and Total Reading tests, as well as the LevelSet Lexile reading assessment.
