<![CDATA[This study aims to evaluate the validity, practicality, and effectiveness of Learning Management System (LMS) media developed using Google Sites for teaching Optical Instrument material to Class XI students at SMAS Istiqlal Delitua. The study focuses on the development of an LMS to enhance students' learning interest. The subjects of this research were 29 students from Class XI IPA 1. The research adopted the ADDIE model for development. The results revealed that the LMS is highly feasible as a learning medium. Assessments by material and media experts yielded average feasibility scores of 93.3% and 91.2%, respectively, both categorized as "Very Good." Student and teacher responses to the Google Sites-based LMS demonstrated a high level of practicality and interest, with an average response score of 91.5%, classified as "Very Practical/Interesting." The effectiveness test, based on pretest and posttest comparisons, indicated significant improvement in students' learning outcomes. The t-test result showed an Asymp. Sig (2-tailed) value of 0.000 (0.05), confirming a significant difference between pretest and posttest scores. The average N-Gain score was 0.62, categorized as "Effective." In conclusion, the Google Sites-based LMS is valid, practical, and effective, significantly enhancing students' understanding and interest in learning Optical Instrument material.]]>
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