Effectiveness of Cognitive Tutor Algebra I at Scale

This article examines the effectiveness of a technology-based algebra curriculum in a wide variety of middle schools and high schools in seven states. Participating schools were matched into similar pairs and randomly assigned to either continue with the current algebra curriculum for two years or to adopt Cognitive Tutor Algebra I (CTAI), which uses a personalized, masterylearning, blended-learning approach. Schools assigned to implement CTAI did so under conditions similar to schools that independently adopt it. Analysis of posttest outcomes on an algebra proficiency exam finds no effects in the first year of implementation, but strong evidence in support of a positive effect in the second year. The estimated effect is statistically significant for high schools but not for middle schools; in both cases, the magnitude is sufficient to improve the average student’s performance by approximately eight percentile points.