Abstract
Collaboration is one of the essential 21st-century skills and can have an impact on learning outcomes. The application of PBL is expected to train collaboration and improve students' cognitive learning outcomes. The research aimed to discover the increase in collaboration and cognitive biology learning outcomes of students using PBL through Lesson Study. This type of research uses classroom-based action research. The research subjects were students at SMA Negeri 3 Jember class X5, the academic year 2022/2023, totaling 35 students. The implementation phase of classroom-based action research is carried out through Lesson Study. The results show that applying PBL through Lesson Study can improve collaboration and students' cognitive biology learning outcomes. Increased student collaboration is evidenced by an average score of 64 (cycle 1), 75 (cycle 2), and 92 (cycle 3), while student cognitive learning outcomes are evidenced by an average value of 71 (cycle 1), 78 (cycle 2), and 86 (cycle 3). The findings of this study can be a solution for educators to apply PBL through Lesson Study as an alternative to improve collaboration and students' cognitive biology learning outcomes.
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