This study explores how collaborative action research (CAR) can enhance high school geography teachers’ curriculum making capabilities and strengthen their status as “boundary workers.” The research team consisted of a graduate student pre-service geography teacher, a university theoretical mentor, and a high school practical mentor. The study lasted four months and employed a mixed-methods approach, utilizing four rounds of CAR to continuously reflect on and evaluate the effectiveness of boundary work-based high school geography curriculum making and its impact on enhancing pre-service teachers’ curriculum competency. Each CAR round focused on different aspects of curriculum making, such as designing problem situations, strengthening teacher-student interactions, creating localized curricula, and using interdisciplinary themes. The four CAR rounds collectively formed a “boundary work-based geography curriculum making model.” The research findings indicate that through sustained practice of this model, geography teachers, especially those pursuing graduate degrees, can effectively improve their curriculum leadership and become competent “boundary teachers.”
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