Lesson Study to Scale Up Research-Based Knowledge: A Randomized, Controlled Trial of Fractions Learning

An understanding of fractions eludes many U.S. students. This randomized trial of lesson study supported by mathematical resources assigned 39 educator teams across the United States to locally managed lesson study supported by a fractions lesson study resource kit or to 1 of 2 control conditions. Results suggest that integrating research-based resources into lesson study offers a new approach to the problem of “scale-up” by combining the strengths of teacher leadership and research-based knowledge.