<![CDATA[This research is motivated by the value-action gap phenomenon among students, where high cognitive knowledge about the environment does not correlate with actual daily behavior. This study aims to analyze the implementation of Project-Based Learning (PjBL) with the theme "Sustainable Lifestyle" in Social Studies learning and its impact on forming students' Green Behavior at SMP Nusaputera. This study employs a descriptive qualitative approach with data collection techniques through participant observation, in-depth interviews, and documentation studies. The results indicate that PjBL, through poster investigation projects and tree planting, successfully transformed learning from passive to contextual. There was a shift in student motivation from external compliance to internalized awareness, marked by the emergence of ecological intelligence and empathy for the environment. The findings also confirmed a transfer of learning where environmental care behavior was carried over to the home, validating the synergy of the Tri-Center of Education (Tri Pusat Pendidikan) between school and family. However, this study noted challenges in the peer group realm, where peer hegemony that is permissive towards littering still hinders collective behavioral change. The study concludes that PjBL is effective in forming civic competence according to NCSS standards but requires sustainable social engineering to strengthen communal impact. Keywords: Green Behavior, Project-Based Learning (PjBL), Social Studies Education, Tri-Center of Education, Value-Action Gap.]]>
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