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? What is and how to deal with the difficult point in this lesson? 5. Mathematical methods and thinking: Are there any important math methods or thinking in this lesson? What tasks are suitable for students to learn these methods and thinking? ___based on observation of lesson study What topics do TRs and teachers often talk about during lesson study 6. Teaching and learning theories related to this lesson。 7. Good math problems or tasks maybe used in this lesson。 8. Different design of this lesson。 9. Assessment on teaching and learning before, during and after the lesson。 : papers, books, inters, math history, etc. A theoretic framework of interaction between TR and teachers during lesson study (Gu,2020) Mathematics content Teaching Strategies Task design Improve of teaching behavior Formative assessment Students learning reality Content of interaction General guidance Solve problems posed by teachers Discuss new design or problem with teachers equally Foresee problems may appear in this lesson Levels of interaction Another way of Lesson Study: Videobased lesson study Teacher education should focus classroom Classroom observation Videotape analysis (Text) Case study Videobased lesson study Traditional ways for lesson study Video case study Video play Lesson Clips Related database Cases studies Case question Thank You!