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This study aims to produce products in the form of learning media and instruments based on the 5E learning cycle model on harmonic vibrationÃÂ material. It isÃÂ development research usingÃÂ the ADDIE model consisted of 5 stages:ÃÂ analysis, design, development, implementation, and evaluationÃÂ stagesÃÂ (this study wasÃÂ limited to the development stage). The products developed were Syllabus, Lesson Plan, Student Worksheets, and Critical Thinking Skill Instruments in Physics. The feasibilityÃÂ of the learning mediaÃÂ and instrument developed was measuredÃÂ by three expertsÃ¢â¬â¢ validation by calculating the validity and reliability values of the media and instrument. The validity results basedÃÂ on the expertsÃ¢â¬â¢ assessment showed that the score of the syllabus wasÃÂ 3.70 with very valid criteria. The Lesson PlanÃÂ was 3.66 withÃÂ very valid criteria; the LKPD wasÃÂ 3.66 withÃÂ very valid criteria, and the Critical Thinking Skill Instrument in Physics wasÃÂ 3.63 included in the very valid criteria. The reliability results of the syllabusÃÂ were 94.52%, the Lesson PlanÃÂ was 90.36%, the LKPDÃÂ was 91.78%, and the Critical Thinking Skill Instrument in Physics wasÃÂ 93.62%, indicating that all aspects assessed hadÃÂ a reliable category. BasedÃÂ on these results, it can be concludedÃÂ that the learning media and instrument developed are feasibleÃÂ to use in learning to improve students' critical thinking skills in Physics on harmonic vibrationsÃÂ material.

The development of learning media and critical thinking skill instrument based on 5E learning cycle model on harmonic vibration material