Why is it that projects designed to improve undergraduate STEM education do not always have a positive or lasting impact? In this workshop, Drs. Courtney Ngai, Sarah Wise, and Joel Corbo discuss the importance of attending to department culture to help sustain change efforts in undergraduate STEM education. The presenters will introduce the Department Action Team (DAT) model, which utilizes a principles-focused approach for enacting change. They will also share examples of how the DAT model’s principles have influenced change efforts in STEM departments. The workshop will be complemented by free resources that the team has developed for other stakeholders interested in institutional transformation.