<![CDATA[An interactive multimedia-based digital module developed to improve students' mastery of concepts. This research uses research and development (R&D) methods with the ADDIE model. The ADDIE model consists of 5 stages, is analysis stage, design stage, development stage, implementation stage, and evaluation stage. Inferential statistical data analysis used paired sample t-test. The results of data analysis show that the value of tcount = -32.879 > ttable = 2.080, then there is an influence of digital modules on concept mastery. The feasibility of digital modules is 93.5% and practicality is 88.5%. The results showed that development of digital modules is feasible and practical to be applied in the learning process and had an effect on increasing students' mastery of concepts.]]>
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