<![CDATA[This study aimed to develop, implement, and evaluate the effectiveness of an instructional model integrating the local wisdom of Talang Mamak to enhance the moral and ethical self-efficacy of high school students. Mtilizing a rigorous sequential explanatory mixed-methods design, the research initiated with a quantitative quasi-experimental one-group pre-test/post-test approach (N=30), followed by a qualitative phase involving thematic analysis of in-depth interviews with students, teachers, and key Talang Mamak figures. The model implementation demonstrated a statistically significant increase in students’ Moral Self-Efficacy scores, evidenced by the t-test results improving from a Pre-Test mean of 61.81 to a Post-Test mean of 85.70 (p = 0.000; Cohen's d of 1.95), indicating a large effect size. This high effectiveness affirms the necessity of contextual teaching and learning in character formation. However, inconsistencies in the value of honesty among subjects necessitate a critical theoretical expansion. The findings propose a reformulation of the highest moral stage to include a communal-transcendental ethical Stage to better reflect the collective, spiritual dimensions of indigenous Indonesian ethics. The Talang Mamak PjBL model is a validated, high-impact blueprint for character education. It offers a significant empirical and theoretical contribution by providing a contextually grounded and statistically confirmed and thereby strengthening national character through cultural preservation.]]>
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