<![CDATA[This study aims to develop STEM-based science teaching aids prototypes through the Project-Based Learning (PjBL) model among elementary teacher education students. The research employed the ADDIE development model, encompassing analysis, design, development, implementation, and evaluation stages. Five prototypes were successfully developed using natural materials, recycled items, household objects, basic laboratory tools, and synthetic materials. Expert validation from media and content specialists indicated the products were highly feasible. Students' responses to both the learning process and media were highly positive, demonstrating active engagement, increased motivation, and deeper understanding of science concepts. Effectiveness testing showed a significant improvement in conceptual understanding, with a gain score of 0.56 (moderate–high category). This study confirms that integrating STEM approaches with PjBL effectively enhances pre-service teachers’ ability to develop innovative teaching aids tailored to the needs of elementary school learners.]]>
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