Change in agricultural practices in Kapuas Hulu, West Borneo, Indonesia cannot be separated from the influence of external and internal factors. External factors such as a burn ban policy, economic opportunities, and new knowledge of permanent plot agriculture as well as internal factors in the form of efforts to maintain their culture affect decisions about agricultural practices. This research uses mental model analysis through the combination of qualitative interviews and Conceptual Content Cognitive Mapping (3CM) to understand cognition structures that form the basis of decision making regarding family agriculture. Findings from this study suggest there is a complex combination Corpus component (local knowledge system), Praxis (local management), Kosmos (local beliefs), financial consideration, and external forces that interact with each other in the mental model of Dayak farmers. This combination results in various decisions about conducting agricultural practices.