<![CDATA[Problem-solving skills are essential 21st-century competencies for pre-service science teachers; however, preliminary findings indicate that these skills remain low in chemistry learning. This study aimed to develop and evaluate the effectiveness of an EthnoSTEM (Ethnoscience, Technology, Engineering, and Mathematics)-based WebQuest to enhance students’ problem-solving skills. The study employed Research and Development (R&D) using the ADDIE model, combined with a quantitative quasi-experimental approach using a Nonequivalent Control Group design. Participants were 50 fourth-semester Science Education students at Universitas Sultan Ageng Tirtayasa during the 2025/2026 academic year, assigned to experimental (EthnoSTEM-based WebQuest) and control (E-Module) groups. Data were collected using pretest-posttest problem-solving assessments and analyzed using ANCOVA. Expert evaluations indicated that the developed media was valid. ANCOVA revealed a significant difference in posttest scores between groups after controlling for pretest scores, F(1,47) = 22.782, p < 0.001, partial ?² = 0.326. The experimental group achieved a higher adjusted mean score (86.07) than the control group (81.03). These findings demonstrate that integrating local wisdom into WebQuest-based learning effectively enhances students’ problem-solving skills. The developed medium also provides a contextualized and potentially replicable framework for chemistry and science learning grounded in local knowledge.]]>
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