This article is based on an experience during family medicine residency in a family medicine practice participating in the MOCCA project (Coordination model in family medicine practices). This new model of care integrates a family medicine nurse (FMN) into the team of each practice. Three clinical vignettes and an interview with the people involved provide a better understanding of the new role that the FMN can play in medical practices. In these situations, we note an increase in the possibilities of acting in prevention and health promotion as well as a reinforcement in the continuity of care. An experience of this type during medical residency is not common in Switzerland, because Switzerland is in the early stages of development of these new models of care in international comparison.