Lesson study is a dynamic and research-driven approach to designing lessons. It is an experimental model that allows teachers to test many approaches in a trial-and-error process to arrive at the most suitable method for a given question or problem. Lesson study assesses how a lesson is structured, how students interact with it, and how outcomes match expectations. Aimed at practical classroom use, it is created by and for teachers who enact classroom situations to discover efficient strategies. Lesson study is a collaborative practice that provides educators with a framework to plan, observe, and discuss lessons in order to better serve students.

Although a highly effective way to refine teaching, lesson study is not yet widely used in U.S. schools. Those who have tried it know that it leads to better instruction and more engaged students. Articles in the Press section of our website describe the Japan math process in more detail. 

Sansu Math® is the only U.S. mathematics curriculum developed in conjunction with lesson study. It is an English version of the most popular elementary math curriculum in Japan, New Mathematics. The authors of Sansu Math® observed and collaborated closely with Japanese teachers to create this meticulous and thoughtful program.

A common theme throughout Sansu Math® is the emphasis on teaching through problem solving. The student-centered style encourages classroom discussion and small group exploration to approach problems from multiple perspectives. Teacher's Guides provide educators with anticipated student responses, which in turn allow them to present a variety of problem-solving strategies that encourage creative and critical thinking in response to new mathematical challenges.