<![CDATA[This research aims to improve students' critical thinking skills SMAN 1 Bambanglipuro by applying the Problem Based Learning (PBL) learning model to Chemistry Subjects. This research is a classroom action research (CAR) carried out in 2 cycles. Each cycle consists of planning, implementing actions, observing, and reflecting. The research subjects were students of class XI MIPA 3 of SMAN 1 Bambanglipuro in the academic year 2019/2020. Techniques used in collecting data include observation, tests, and documentation. Analysis of the data used includes the presentation of data and drawing conclusions. The results showed that the Problem Based Learning (PBL) Learning Model in Chemistry Subjects can improve students' critical thinking skills. The observations of critical thinking skills in cycle I were 57.58% and cycle II were 78.79% and test results critical thinking skills in the first cycle of 45.45%, the second cycle of 87.88%. The conclusion of this research is Problem Based Learning (PBL) Learning Model can improve critical thinking skills on Thermochemistry material for students of Class XI MIPA 3 SMAN 1 Bambanglipuro.]]>
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