<![CDATA[The problems in this study are educators who have not used the science learning module in the teaching and learning process and the low learning outcomes of students because of the lack of students' ability to construct the knowledge they get. The aims of this study were: to know feasibility, to know practicality, to know the effectiveness of inquiry-based learning modules in material classification materials and their changes for class VII SMP/MTs in the learning process. This research is a development research using the 4D development model which consists of define, design, develop, disseminate. The instrument used is a validation questionnaire which includes aspects of content feasibility, language feasibility, and design feasibility, student response questionnaires and learning achievement tests. The feasibility of inquiry-based modules by lecturers as content and material expert validators obtained a score of 85 with a 100% achievement level in the "very feasible" category, while from subject teachers obtained a score of 88 with a 100% achievement level in the "very feasible" category, the linguist validator obtained a score 59 with an achievement level of 100% in the "very feasible" category and the design expert validator obtained a score of 88 with a 100% achievement level in the "Very feasible" category, practicality of the inquiry module on material classification material and its changes, small group test obtained a maximum score of 77 with the achievement level 67% in the "practical" category, field trials obtained a maximum score of 494 with an achievement level of 90 in the "very practical" category, the effectiveness of inquiry-based modules on material classicization and its modifications with a success rate of 84% in the "very effective" category.]]>
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