Abstract

This study aims to develop problem-based learning tools to improve students' conceptual understanding and critical thinking skills. The development model will be carried out through the define, design, development and disseminate stages. The learning tools developed in this study are in the form of a syllabus, Semester Program Plan, Student Work Sheets and instruments for understanding concepts and critical thinking skills. The results of the developed learning tools are valid with an average value of 88.13 with a very decent category, and understanding the concept of each sub-material has an increase seen in the highest N-Gain value in the entropy sub-material with a value of 0.79 in the high category. Meanwhile, the ability to think critically using the PRISCO indicator shows an increase in each indicator and the highest N-Gain value on the Inference and Clarity indicators with a value of 0.75 and 0.76. From the inference and clarity indicators, students can make conclusions and explain again the thermodynamic material that has been taught.

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