Contents: J.W. Stigler, Foreword. Introduction. An Overview of Lesson Study. Lesson Study at Tsuta Elementary School. Illustrating the Lesson Study Through the Work of Five Tsuta Teachers. Drawing Up a Preliminary Lesson Plan. Refining the Lesson Plan. Preparing to Teach the Study Lesson. Teaching the Study Lesson. Discussing How to Improve the Study Lesson. The Revised Lesson Plan. Teaching the Revised Lesson. Sharing Reflections About the Study Lesson. Follow-Up Activities: Sharing and Reflecting. Strategies for Avoiding Isolation in Order to Enhance Lesson Study. Conclusion. Appendices.