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Iqro IT High School is one of the high school level schools based on Islam in the city of Bengkulu. This study aims to improve the learning outcomes of class XI students and enhance the role of teachers in enhancing collaborative biology learning. This type of research is action research conducted using the lesson study method. Lesson studies are carried out collaboratively by involving the roles of teachers, peers, and lecturers. Lesson study activities carried out in two open lessons, where each open lesson consists of 3 sessions namely plan, do, and see. The instrument used in this study was the observation sheet of the implementation of lesson study and the test sheet of learning outcomes. The results showed an additional increase in the study of lessons from open lesson 1 to open lesson 2. In addition there was also an increase in learning outcomes from open lesson 1 to open lesson 2. The conclusion of this study is that lesson study can help teachers to enhance their role in teaching and learning and be able to improve student learning outcomes in biology subjects.