<![CDATA[This study aims to describe the development process, validity level, and practicality level of a problem-posing-based scrapbook medium for the Natural and Social Sciences (IPAS) subject on the ecosystem topic for fifth-grade elementary school students. This is a Research and Development (R&D) study adapting Sugiyono's model, limited to seven of ten stages: potential and problems, data collection, product design, design validation, design revision, product trial, and product revision. Research subjects consisted of one subject-matter expert, one media expert, one fifth-grade teacher, and eight fifth-grade students at SDN 4 Cakranegara. Data were collected through questionnaires and documentation and analyzed descriptively based on percentage scores. Results show that the developed medium, covering Chapter 2 "Harmony in Ecosystems," topic "Eating and Being Eaten," achieved a validity percentage of 90% from the subject-matter expert and 92% from the media expert, both in the "highly valid" category. The practicality test yielded a 98% response from the teacher and 97% from students, both categorized as "highly practical." These findings indicate that the problem-posing-based scrapbook medium is valid and practical for teaching the ecosystem topic in fifth-grade IPAS classes, although the trial remains limited to a small group and generalization should be made cautiously.]]>
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