<![CDATA[Basic education plays an important role in the formation of students' character, including environmentally conscious behavior. However, initial observations indicate that third-grade students at SD Negeri 4 Madurejo still have low independence in disposing of waste properly and tend to rely on teacher reprimands, even though the school has been selected to participate in the Adiwiyata program. This study aims to develop a modified Project Based Learning (PjBL) learning model that is valid, practical, and effective. The research method used is Research and Development (R&D) with the ADDIE (Analysis, Design, Development, Implementation, Evaluation) model. The research subjects involved third-grade students at SD Negeri 4 Madurejo. Data collection was carried out through expert validation sheets, teacher and student response questionnaires, and environmental behavior observation sheets. The results of the study showed that: (1) The modified PjBL model was declared feasible based on material validation tests (78%), media experts (80%), and practitioners (77.14%). (2) The model was assessed as very practical with teacher and student response scores reaching 91.9% (small scale) and 93% (large scale). (3) The model was proven to be effective in significantly increasing students' environmental care behavior, from the 'Low' category (32.4%) during pre-observation to 'Good' (79.8%) during post-observation. In conclusion, the modified PjBL model with a focus on 75% practical field activities is effective in accelerating the internalization of environmental care character and student independence.]]>
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