<![CDATA[This study aims to produce a valid, practical, and effective bilingual calculus module based on Content and Language Integrated Learning (CLIL) to improve students' mathematical problem-solving ability and English vocabulary mastery. The study used a Research and Development (RD) approach with the ADDIE model. Validity was assessed by three experts (content, language/CLIL, and media). Practicality was tested on 35 students through a response questionnaire, while effectiveness was tested on 35 Mathematics Education students using a one-group pretest-posttest design. Validation results placed the module in the very valid category with an average score of 4.44 out of 5 (88.9%). The questionnaire results showed very practical practicality with an average score of 3.70 out of 4 (92.5%). The effectiveness test showed mathematical problem-solving ability increased from 65.00 to 88.37 (N-Gain 0.67; medium category), and English vocabulary mastery increased from 63.51 to 88.20 (N-Gain 0.68; medium category). A paired t-test showed significant improvement on both variables (p .001) with large effect sizes (Cohen's d = 5.24 and 6.41, respectively). These findings indicate that the CLIL-based bilingual calculus module is feasible as an alternative teaching material to support the integration of mathematical content and English in higher education.]]>
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