This study aims to describe students' critical thinking skills. The research design used is a pre-experiment with a one-group pre-test-post-test design technique. The research sample consisted of 38 students from class VIII-C of SMP Negeri 2 Sidoarjo, and the sampling technique used was purposive sampling. The data collection technique in this study was a test. The increase in critical thinking skills using N-Gain obtained a score of 0.7, which is categorized as high. Based on these results, it can be concluded that the application of a structured inquiry model assisted by PhET simulation on the material of vibrations and waves can improve students' critical thinking skills.
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