The low level of student learning activity in Civic Education (PPKn) at SMAN 1 Jatisari motivated the use of Kartu Budaya Nusantara (KBN), a card-based learning medium containing Indonesian cultural information. This study aims to describe the planning and implementation of KBN, identify forms of student learning activity during its use, and examine supporting and inhibiting factors. The study employed a descriptive qualitative approach. Participants were one PPKn teacher and six grade X students selected purposively to represent active and less-active students and different cultural backgrounds. Data were collected through in-depth interviews, participatory observation, and documentation, and analyzed thematically through data condensation, data display, and conclusion verification. Data credibility was strengthened through source and technique triangulation and member checking. The findings indicate that KBN was implemented through systematic planning, cooperative group activities, cultural-card exploration, discussion, presentation, and reflection. Classroom observations and interviews showed increased student involvement in physical, cognitive, affective, and social activities during the KBN lessons. The original field notes recorded question frequency of approximately 3–4 questions in an earlier observation and 8–12 questions in a later observation; because the denominator and standardized observation protocol for converting these counts into percentages were not documented, the revised manuscript does not interpret them as statistical evidence of improvement. The findings suggest that KBN can facilitate more active and culturally relevant PPKn learning, particularly when each student has a distinct piece of information that must be shared with the group. However, the findings are context-specific and cannot be generalized to other schools without further research.
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