Abstrak: In Order to improve teaching and learning activity, “Teacher Competence” as a move factor should be improve according to the demands. In japan teacher competence perform through portofolio base on lesson study concept. Lesson Study as a learning and teaching model, emphasize on improvement process, which implemented in 3 phase. The three phase is a unity which perform in continuity. Each phase perform collaboratively which could motivate two way comunication and interaction, and in the end will effect on teacher competence improvement.
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