Development of Lesson Plans by the Lesson Study Approach for the 6 th Grade Students in Social Study Subject based on Open Approach Innovation

Abstract The purpose of this research was to: 1) develop lesson plans 2) develop the students thinking skills 3) study the student's opinions. This research is experimental with target group. The instruments were: 1) 11 Lesson plans 2) an observation form 3) an achievement test with an emphasis on thinking skills; 4) Student questionnaire. The one experimental group design was used with subject. Mean, percentage, and effectiveness index were used to analyze the collected data. Finding: 1) Have Lesson plans 2) Over 80% of the students passed the criteria in the achievement test with an average score of 81.95%. 3) The score of student's satisfaction was at the highest level ( X = 4.56).