<![CDATA[This study was motivated by the low level of cooperation skills among children in Group B of TK Harapan Bunda, as indicated by their reluctance to share, difficulties in working collaboratively, lack of respect for peers' opinions, and inability to complete tasks together. The purpose of this study was to describe teacher activities, children's activities, and to analyze the improvement of children's social-emotional development, particularly in cooperation skills, through the implementation of the Problem Based Learning (PBL) model with Loose Parts media. This study employed a qualitative approach using Classroom Action Research (CAR). The subjects consisted of 11 children in Group B of TK Harapan Bunda, including 7 boys and 4 girls. The research was conducted in four meetings. Data were collected through observations of teacher activities, children's activities, and children's social-emotional development outcomes. The data were analyzed using qualitative and quantitative descriptive techniques.]]>
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