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The purpose of this research is to examine the performance of Problem Based Learning (PBL) by metacognitive strategy and critical thinking profile achieved by the students. The research used mix method with type explanotary sequential, while the research planning with the type of pre-test post-test control group design. The Subjects were the XI grade students in SMA 1 Kudus in the academic year 2017/2018. Data collection used essay questions and interview to describe the students’ critical thinking ability on optical devices. The research result showed that PBL by using metacognitive strategy was effective to improve the students’ critical thinking than PBL. The metacognitive strategy used in PBL learning trains the students to think to solve the problems faced. PBL by using metacognitive stategy has performed the higher score in indicator of asking and answering the questions, making and considering result, and integrating, but performance score was lower than the indicator which formulates questions, doing observation and assessing observation result report and defining and assessing the definition.

Students’ Critical Thinking Performance through Problem-Based Learning by Using Metacognitive Strategy