Cultural change that requires revision of taken-for-granted assumptions is necessitated to enact programmatic changes. However, such cultural change processes are challenging and time-consuming and therefore require continued support and resources. Data sensemaking is one important aspect of culture that local stakeholders often overlook. In this project, we study the change process enacted by local Departmental Action Teams (DATs) resulting from physics faculty members' participation in the Departmental Leadership Action Institutes (DALIs). This study followed two faculty change leaders from one physics program in their journey in DALI and their DAT over a year. This paper discusses preliminary interview results that help us understand how the DAT's microculture is situated within the dominant departmental culture, focused on the facet of data use. For example, we found that past data collection efforts were a primary responsibility of a single person and rarely became the focus of joint attention. Within the DAT, in contrast, a broad set of stakeholders engaged in joint data collection and sensemaking that informed decision making and led to revising initial assumptions about what programmatic changes might be needed in order to reach their goal.