<![CDATA[Ethnoscience-based wave and sound materials are considered difficult because students must connect abstract concepts with daily phenomena and local cultural beliefs. Interactive teaching materials can improve students’ understanding and critical thinking skills. Therefore, this study aimed to develop a valid and feasible ethnoscience-based e-module as a learning medium. This research employed a descriptive qualitative approach. The validation process included media, material, learning expert, and language validation conducted by experts and practitioners. Media validation covered presentation techniques, completeness, e-module size, cover design, and content design. Material validation included content completeness, scope, depth, accuracy, and contextual relevance. Learning expert validation assessed learning content, strategies, evaluation, and assessment, while language validation examined language appropriateness, communication clarity, interactivity, suitability for students’ development, and language accuracy. The results showed validity scores of 0.88 for material, 0.90 for media, 0.94 for learning experts, and 0.98 for language, indicating that the Rapai Geleng Aceh e-module is valid and feasible for improving students’ critical thinking skills]]>
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