<![CDATA[This study aimed to develop a Problem Based Learning (PBL)-based Student Worksheet assisted by GeoGebra to improve junior high school students' mathematical understanding of the topic of Curved Surface Solids. The study employed the Research and Development (R&D) method using the ADDIE development model, which consists of the analysis, design, development, implementation, and evaluation stages. The participants were 19 ninth-grade students from a private junior high school in Cimahi City, Indonesia. The developed worksheet was evaluated by subject matter experts, media experts, and education practitioners. The validation results indicated that the product achieved a very high level of validity. The field trial demonstrated an improvement in the students' mathematical understanding. Furthermore, the N-Gain analysis yielded a score of 0.71, which falls into the high category. These findings indicate that the GeoGebra-assisted PBL-based Student Worksheet is valid, practical, and effective for enhancing students' mathematical understanding of Curved Surface Solids.]]>
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