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The Effectiveness of Problem Solving-Based Student Worksheet to Improve Students’ Critical Thinking Skills Rudibyani, Ratu Betta The Effectiveness of Problem Solving-Based Student Worksheet to Improve Students’ Critical Thinking Skills. Objectives: This research aimed to find out the effectiveness of student worksheets based on problem solving in science learning to improve students’ critical thinking skills. Methods: The research population were all tenth-grade science students in one of the Senior High Schools in South Lampung in the even semester of 2017/2018 academic year with the sample was selected using cluster random sampling. This research used d a quasi-experimental method with Pretest-Posttest Control Group Design.The effect of the worksheet was measured based on the mean value of n-Gain of the students’ critical thinking skills. The effect size effect size calculation was also applied. Findings: The result showed that the n-Gain value mean of the students’ critical thinking skills in the experimental was 0.71 and the effect size was 0.89. Conclusion: students’ worksheet based on problem solving in science learning is very effective to improve students’ critical thinking skillsKeywords: students’ worksheet, problem solving, critical thinking skill. FKIP Universitas Lampung 2020-04-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jpp.fkip.unila.ac.id/index.php/jpp/article/view/651 Jurnal Pendidikan Progresif; Vol 10, No 2 (2020): Jurnal Pendidikan Progresif; 279-291 2550-1313 2087-9849 eng https://jpp.fkip.unila.ac.id/index.php/jpp/article/view/651/474 Copyright (c) 2020 Ratu Betta Rudibyani https://creativecommons.org/licenses/by-sa/4.0