<![CDATA[This study aims to determine the feasibility, effectiveness, and practicality of the MEFOSIS learning media (Metamorphosis Flipbook Media) in improving conceptual understanding of fourth-grade elementary school students. This is a research and development (R&D) study using the 4D model (Define, Design, Development, and Dissemination). The subjects were fourth-grade students at SD Negeri Brajan, Kasihan, Bantul, consisting of 10 students in a limited trial and 18 students in a field trial. Data collection techniques included questionnaires and tests, with data analysis using percentages and paired sample t-tests. The results show: (1) MEFOSIS media is highly feasible, with expert assessments of 93% for media and 98% for content, both categorized as “Highly Feasible.”. (2) The media is effective in improving students' conceptual understanding, evidenced by increased average scores from pretest to posttest: from 53 to 76 in the limited trial and from 69 to 80 in the field trial. The paired sample t-test showed a significance value of 0.000 < 0.05, indicating a significant difference between pretest and posttest scores. (3) MEFOSIS is also proven to be practical. In the limited trial, student and teacher responses were 94% and 90%, respectively, while in the field trial they were 98% and 94%, all falling into the "Very Good" and "Highly Feasible" categories. Thus, MEFOSIS is feasible, effective, and practical for teaching the concept of metamorphosis]]>
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