<![CDATA[Students’ critical thinking skills in mathematics are not yet optimally developed, particularly in geometry learning, which is often presented in an abstract manner with limited connection to real-life contexts. This study aimed to develop a STEM-integrated instructional module based on an inquiry-oriented learning framework for three-dimensional geometry using a water purification context to create more meaningful learning experiences. The study employed a development research design using the ADDIE framework, which consists of five phases: analysis, design, development, implementation, and evaluation. The participants were 20 ninth-grade students from a lower secondary school (SMP Mambaul Ulum). Data were collected through expert validation forms, student response questionnaires, and a critical thinking skills test to evaluate the module’s validity, practicality, and effectiveness. The findings revealed that the developed module met the required criteria. It demonstrated a high level of validity, with a score of 82%. The practicality of the module improved from 65% in the initial trial to 75% after revision. Furthermore, its effectiveness was reflected in the improvement of students’ critical thinking skills, with mastery levels increasing from 75% to 85%. Overall, the results indicate that the inquiry-based STEM module is both appropriate and effective as an instructional resource, as it supports learning that is closely connected to real-life contexts and enhances students’ critical thinking skills in three-dimensional geometry.]]>
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