Discovering Mechanisms of Changes during Lesson Study in Mathematics Classroom

In the current study the Main purpose is to use a new model of lesson study which discover mechanisms of change in the mathematics classroom. In this regard, six secondary school mathematics teachers and one professor of mathematics education co-operation for developing a new lesson which related to concept of trigonometry. This study administrated in 6 months and all members participate in 6 sessions for developing 3 research lessons. Indeed, lesson study was used as research design in current study. Results of this study show that the modified lessons which developed through respiting lesson study cycle in 3 times, work effectively and teaching method of mathematics’ teachers was enhanced caused by this lesson study experience. Analysis of data reveals the mechanism of changes during this lesson study which are common attention, share experiences, observe challenges of teaching in the classroom, and feel the need and urgency of change. Furthermore, participants in this study mentioned some benefits of doing lesson study as affordances which are considering students’ needs, increasing teachers’ capability in the process of teaching and learning mathematics when students work in the group. Participant teachers in current study discussed about difficulties of using lesson study in their mathematics classroom.