This article presents a theoretical model of lesson study's impact on instruction, through intervening impact on teachers' knowledge, beliefs and dispositions, teachers' learning community, and curriculum. It also describes four different types of lesson study in Japan, pointing out their synergies in producing a system where local teachers…

During "lesson study" teachers formulate long-term goals for student learning and development, collaboratively work on "research lessons" to bring these goals to life, document and discuss student responses to these lessons, and revise the lessons in response to student learning. This document summarizes the content of a…