Successful resuscitation requires good teamwork, communication and quick decision-making. The complexity of the situation makes the communication often erratic. As a consequence, improper decisions can be taken and errors can occur, endangering patients. In order to support the resuscitation team in their work, we developed an innovative product named Interconnected and Focused Mobile Applications on Patients Care Environment (InterFACE), enhancing team situational awareness, and improving the team communication process. To develop our solution, we relied on a user-centred design process involving caregivers from both adult and paediatric emergency departments. The process started with interviews and observations, followed by an iterative development approach validated at each step by end-users. The resulting intervention is composed of a tablet app interacting with a large screen, visible to each members of the resuscitation team, presenting real time information about the resuscitation. Resuscitations are very complex and challenging situations involving many actors. Designing a support tool for such situations requires a strong involvement of end users to understand how people work together and what information they share.