<![CDATA[This study aims to develop a valid, practical, and effective QR-Code-based Smart Box media for fourth-grade social studies learning for fourth-grade students at Rejosari Public Elementary School. This study uses the ADIIE model with a Research and Development type of research. The subjects were experts, teachers, and fourth-grade students at Rejosari Public Elementary School. Data collection techniques included observation, interviews, questionnaires, question validation, and tests. The instruments used were questionnaires and 15 written questions. Based on the results of the Smart Box media validation analysis using Aiken's V, the assessment of the language validator was 0.98 with a high category, the media validator was 0.87 and the material validator was 0.89. The analysis of the teacher and student practicality sheet assessment met the practical criteria with a score of 99% with a very practical category, then the effectiveness assessment analysis obtained an N-Gain score with an average of 0.67 with a moderate category. Based on the results of the study, it can be concluded that the Smart Box media in science learning for fourth-grade students of Rejosari State Elementary School is proven to be valid, practical and effective so it is suitable for use in science learning for fourth-grade students of Rejosari State Elementary School. Keywords: Science, Smart Box, Development, Elementary School]]>
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