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The purpose of this paper is to explain how initial teachers in Japan can develop instructional and thinking skills through lesson study with mentors. It will clarify the point of view in which mentors evaluate the lesson plan, research lessons and kyouzai-kenkyuu of initial teachers.

This study adopts a case analysis that shows how a mentor gives advice to an initial teacher in the post-lesson discussion. In Japanese lesson study, the time schedule of the post-lesson discussion is well structured, so the time for a mentor to state his or her comment is limited to around ten minutes. Mentors try to help initial teachers develop instructional and thinking skills.

From simple problem to high-level cases in which finding the problem of a lesson is difficult, only a highly competent mentor can find the problem and suggest improvements. Mentors need the competency to observe the lesson and the knowledge and skills to improve the lesson.

This paper focusses on how mentors can help develop the kyouzai-kenkyuu understanding of initial teachers. More studies that focus on how mentors can train initial teachers to understand how students learn during lessons are needed.

This paper discloses what Japanese teachers think of lesson plans and kyouzai-kenkyuu and how mentors help develop kyouzai-kenkyuu understanding among initial teachers.

The purpose of this paper is to clarify the lesson study (LS) processes and evaluate their effectiveness in Japanese elementary and secondary (middle and high) schools, through a school survey by the National Institute for Educational Policy Research of Japan (NIER).

The authors randomly selected 1,000 elementary schools and 1,000 middle schools and 500 high schools in Japan. Survey items are methods of LS, and indicators of building professional learning communities (PLC) through LSs, close communication between teachers, high quality instruction by teachers, and test scores of students of the school.

Based on the school survey in elementary and middle schools, almost all schools set up a school‐wide committee, a research theme, and a schedule for LS, and LSs were implemented as part of a school‐wide lesson study from which an action research report is produced. On the other hand, in high schools, almost all the schools implemented LSs, but each LS is independent and implemented specifically for the professional development of the individual teacher who undertakes the research lesson. The authors consider LS as a way to facilitate a PLC in the school. There are correlations between the methods of LS and the indicators of a PLC in elementary and middle schools. However, the effectiveness of LS differs between elementary and middle schools. With respect to the research theme and the organization and discussion of lesson plans, LS methods in middle schools are developed into LS methods in elementary schools. The LS methods may be developed gradually both in elementary and middle schools.

Statistical data of LS in Japanese elementary and secondary schools are presented for the first time, demonstrating the effectiveness of LS.

This chapter considers ways in which lesson study may be introduced and sustained within the school–university partnerships that already exist within an initial teacher education (ITE) course. In particular, the authors describe the challenges and opportunities associated with ITE lesson study partnerships and ways in which lesson study can deepen and even transform the nature of the school–university partnership. The authors draw on third-generation Cultural-Historical Activity Theory (Engeström, 2001) to highlight pre-service teachers’ roles as ‘boundary crossers’ between the activity system of the university ITE course and the activity system of the school department in which they are placed. The authors argue that pre-service teachers, despite their inexperience as teachers, have an important opportunity to introduce the practices of lesson study that they are learning about into the schools in which they are placed. They are also able to promote approaches to lesson planning and observation that support the values of the course and thus, through mentor development, strengthen the school–university partnership more widely than the specific lesson studies carried out. The authors outline three models for productive ITE lesson study partnerships, and argue that even a relatively small number of lesson study events throughout the school year can establish the beginnings of a transformation in the school culture away from a performative focus on evaluating the teacher and towards a more productive focus on school students’ learning. This, in turn, deepens the partnership between university and school by aligning both parties more closely around a shared focus on studying learning.

The purpose of this paper is to present how experiences gained from a theory-informed lesson study – learning study (LrS) – in regard to a specific learning goal can be shared and used by other teachers in new contexts.

A group of teachers worked together in a cyclic, iterative process of planning, evaluating and revising teaching. The aim was to provide possibilities for grade 2 and 3 students to become familiar with negative numbers. The teacher group came to the conclusion that the students needed to be able to differentiate some aspects of negative numbers. The conjecture was put to the test in a follow-up study (FS) with five new teachers and eight classes. One lesson was taught based on the empirical findings in the LrS.

The results suggest that teachers’ collaborative work has possibilities to produce knowledge about critical aspects of learning that can be communicated and adopted in new contexts. The teachers in the FS were able to make sense of the results from LrS and incorporate the critical aspects in their teaching in a way that enhanced students’ learning.

It is demonstrated that teacher collaboration in LrS can create knowledge that goes beyond the border of the local context.