<![CDATA[This study was motivated by the low levels of student participation, collaboration, and learning outcomes in the IPAS (Natural and Social Sciences) subject in class III-B at SDN Pasar Lama 3 Banjarmasin. The purpose of this study was to improve student participation, collaboration, and learning outcomes through the implementation of the Problem Based Learning (PBL) model. This study was a Classroom Action Research (CAR) conducted collaboratively in one cycle consisting of three meetings. The research subjects were 25 students of class III-B. Data were collected through observation, learning outcome tests, and documentation, and were analyzed using a descriptive comparative method. The results showed significant improvements: student participation increased from 44% (pre-cycle) to 56% (first meeting), 72% (second meeting), and 88% (third meeting). Collaboration skills improved from 36% to 48%, 64%, and 88%, respectively. Learning mastery increased from 48% to 60%, 80%, and 92%. Thus, the implementation of the Problem Based Learning model proved effective in improving the participation, collaboration, and learning outcomes of class III-B students at SDN Pasar Lama 3 Banjarmasin.]]>
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