Based on the mapping of the standard competence/basic competence of students in    each subject is mainly targeted at schools in West Kutai regency into the sample    obtained by the fact that over 50% of the standard of competence in each subject    cannot be reach by the UN students. It is necessary for improvement in the standard    of the learning process to conduct training on constructivist learning for teachers of    each subject and implemented through the lesson study model. The model consists    of lesson study phase of Plan, Do and See. The results of the learning observations    is then discussed in the reflection on the stage See to know what needs to be    improved in the teaching and learning activities of students at the time. Based on    the analysis of the instrument can be concluded that a guide of the lesson study    model is produced that can be applied to implement school-based lesson study in    West Kutai District with the effectiveness of the implementation by 91%, or can be    said to be very effective.    Keywords: Effectiveness, Lesson Study Model, Learning, Constructivism  Â
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