<![CDATA[IPAS instruction regarding the digestive system at SD Negeri 2 Garung Kidul is heavily dominated by verbal lectures and static media, resulting in low conceptual understanding with a pre-research average score of 46.04 and chronic biological misconceptions. This quantitative experimental study utilizing a One-Group Pretest-Posttest design aims to evaluate the effectiveness of the Problem-Based Learning (PBL) model integrated with interactive LANCER media on a saturated sample of 25 fifth-grade students. Data were gathered through a validated 14-item essay test, observation sheets, and interviews, and subsequently analyzed using a paired sample t-test and the N-gain formula. The results revealed a significant leap in the posttest average score to 82.60, achieving a 92% classical completeness rate. The paired sample t-test yielded a significance value of Sig. (2-tailed)= 0.000, indicating a highly distinct variance in conceptual mastery. The intervention's impact is substantially supported by a classical N-gain score of 0.68 (moderate category) alongside an effect size represented by an effectiveness percentage of 67.8%, positioning this combined approach within the quite effective range for quality improvement. These findings demonstrate that integrating LANCER media into Problem-Based Learning substantially enhances conceptual understanding by facilitating visual representation, active inquiry, and collaborative learning.]]>
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