This chapter explores the potential of using ethnographic methods to support medical personnel who are in the process of replacing existing practice with a new research-based care practice—in other words, when a new evidence-based care model is operationalized. The method presented here centres on offering support to the member of the medical team who facilitates the actual implementation—the so-called facilitator—so that the team can better understand the processes at work. The purpose is to highlight how ethnographic methods can make the facilitator’s task of driving the implementation easier.