This study analyzes how the TriniGreen Program transforms community behavior in waste management in Tamiang Layang using the perspective of Triadic Reciprocal Determinism. Employing a qualitative case study at SD Katolik Trinitas, Central Kalimantan, data were collected through focus group discussions, in-depth interviews, and participant observation involving teachers, school committee members, government representatives, and school administrators. Guided by Albert Bandura’s Social Cognitive Theory, the study explores the reciprocal interaction among personal factors, behavior, and environmental conditions. The findings indicate that behavioral transformation develops through continuous interactions between individual awareness, supportive social environments, and repeated environmental practices, including environmental education, waste bank activities, organic waste processing, and the EcoReborn Campaign. These initiatives strengthen both personal and collective agency, encouraging collaboration among schools, families, communities, and government institutions to promote sustainable waste management. The study contributes theoretically by integrating Triadic Reciprocal Determinism with the Agentic Perspective to explain behavioral transformation in school-based social entrepreneurship. Practically, the TriniGreen Program demonstrates that primary schools can serve as community-based social entrepreneurship hubs by combining environmental education, community empowerment, and multi-stakeholder collaboration to foster long-term environmental responsibility and sustainable behavioral change.
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