Abstract

Critical thinking is an important skill that needs to be developed for the future of the students. However, this has not been facilitated properly in the learning process of science at junior high school. This study aims to develop inquiry-based science learning materials that are valid, practical, and effective to improve students' critical thinking skills. This R and D study adapted the 4D model (define, design, develop, disseminate) which is integrated with lesson study activities. The trial subjects in this study were students of class VIII SMPN in the city of Mataram. The development of learning devices uses lesson study activities (plan, do, see) that involve SMPN science teachers in the city of Mataram. Product feasibility testing was carried out by experts using the validation instrument prepared by the researcher. Testing the practicality of the learning process uses the implementation observation sheet, teacher response questionnaire, student response questionnaire, and observation sheet of student's critical thinking abilities. The results of the data analysis show that learning materials were in the category of high validity, high practicality and effective for improving students' critical thinking skills. In conclusion, the learning materials of inquiry-based learning model developed through lesson study activities had proved to improve students' critical thinking skills.

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