This research is motivated by the reality that religious diversity in school environments is often seen as potentially causing conflict and intolerance. However, in reality, not all schools with religious diversity experience conflict. One example is SMP Fidelis Payakumbuh, which has students and teachers from various religious backgrounds, such as Islam, Catholicism, Protestantism, and Buddhism, but so far there has never been a conflict caused by religious differences. This study aims to describe the function of the educational institution as a social system in shaping students' values of tolerance at SMP Fidelis Payakumbuh. This study uses a qualitative approach with a descriptive research type and was conducted at SMP Fidelis Payakumbuh. Data collection techniques were carried out through observation, interviews, and documentation, involving the principal, teachers, and students as research informants. Data analysis was carried out through the stages of data reduction, data presentation, and drawing conclusions, while data validity was tested through triangulation of sources, techniques, and time. This research analysis uses Talcott Parsons' AGIL theory. The research results show that SMP Fidelis Payakumbuh carries out the functions of adaptation, goal achievement, integration, and pattern maintenance through various rules, activities, and habits that instill mutual respect, appreciate differences, and build harmonious social relationships amidst religious diversity. Through these functions, the school successfully shapes students' tolerance values and creates a peaceful, inclusive, and harmonious educational environment.
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