<![CDATA[This study aimed to develop and evaluate Project-Based Learning (PjBL)-based interactive puzzle media to support fifth-grade students’ learning outcomes in Natural and Social Sciences (IPAS), particularly on the human digestive system, at SDN Kembangbelor, Pacet, Mojokerto. The study employed a Research and Development (R&D) approach using the ten-stage Borg and Gall model, encompassing needs analysis, product design, expert validation, revision, preliminary trials, field testing, and final revision. The developed media consisted of detachable digestive-system organ pieces, function cards, teacher guidance, and project-based student worksheets designed to facilitate the stages of PjBL. Product feasibility was evaluated by material, media, design, and peer/teacher experts, followed by a one-to-one trial involving 3 students, a small-group trial involving 6 students, and a field trial involving 14 fifth-grade students. Data were collected through observations, interviews, questionnaires, and pretest-posttest learning-outcome tests and were analyzed descriptively and using N-Gain analysis. The validation results indicated high feasibility, with scores of 93% for material, 87% for media, 92% for instructional design, and 100% for peer evaluation, all categorized as very feasible. Student learning outcomes progressively increased across the trials: the mean score increased from 58 to 82 in the one-to-one trial, from 60 to 87 in the small-group trial, and from 66 to 96 in the field trial. In the field trial, the mean N-Gain score was 0.73, categorized as high, while 12 of 14 students (85%) achieved the mastery criterion. Student responses were also positive, with 95% reporting that they enjoyed group- and project-based learning. These findings suggest that the developed media was feasible, practical, and potentially effective for supporting concrete, collaborative, and project-based IPAS learning within the study context]]>
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