This study aimed to analyze the influence of the Project-Based Learning model using the "Grow Me" technique on the *gotong royong* (mutual cooperation) character—specifically the aspects of mutual respect, helping others, deliberation, empathy, and solidarity—within the Pancasila Education subject. A quasi-experimental research design with a pretest-posttest control group approach was employed to examine the model's impact on these aspects. Quantitative data were collected using non-test instruments, specifically expert validation sheets and observation sheets. The results indicate that the Project-Based Learning model with the "Grow Me" technique significantly influenced *gotong royong* attitudes. Regarding the aspect of mutual respect, the experimental class achieved a posttest mean of 97.98 compared to 77.60 for the control class, with an N-Gain of 89.33%. For the aspect of helping others, the experimental class scored 85.07 and the control class 77.60, with an N-Gain of 68.64%. In the deliberation aspect, the experimental class scored 82.17 and the control class 77.60, with an N-Gain of 40%. For empathy, the experimental class scored 85.61 and the control class 73.04, with an N-Gain of 75%. Finally, for solidarity, the experimental class scored 85.61 and the control class 73.04, with an N-Gain of 85% (categorized as "high"). Overall, the use of the Project-Based Learning model with the "Grow Me" technique had a significant effect on *gotong royong* attitudes across the aspects of mutual respect, helping others, deliberation, empathy, and solidarity.
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