<![CDATA[Students' conceptual understanding of the material on central tendency measurement is crucial in mathematics learning, as a foundation for data-based decision making in real life. This study aims to develop a teaching modul as a feasible, practical, and effective cooperative learning design. The development was carried out using the 4D model (Define, Design, Develop, Disseminate). The research design follows systematic steps from needs analysis to dissemination of learning products. The results of the study indicate that the developed teaching module is feasible, practical, and effective in improve students' conceptual understanding. This product has a positive impact on students' active involvement and strengthens critical thinking skills in mathematics learning, so it can be an alternative used by teachers to improve the material on central tendency measurement.]]>
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