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Many educators in the United States have recently become interested in lesson study, a professional development approach popular in Japan, as a promising source of ideas for improving education (Stigler and Hiebert 1999). Numerous schools and school districts have attempted to use lesson study to improve their teaching practice and student learning (Council for Basic Education 2000; Germain- McCarthy 2001; Lewis 2002; Research for Better Schools 2002; Stepanek 2001; Weeks 2001).
Takahashi et al. (Sat,) studied this question.