SIGAME is a web-based application for national cooperation in case of disaster. The main motivation of SIGAME is to provide a quick, flexible, reliable, many-to-many, updated communication channel for improving and coordinating the response of assistance suppliers (located at several territories) when an emergency occurs. In order to make communication as efficient as possible and taking into account the organizational diversities of the suppliers, the political implication and the characteristics of the future users, a user centered design method for web-based interactive systems seems to be the best solution for attending the designer through the different phases and products of the design process. In particular, we will focus on the techniques used both to involve stakeholders in the design and to collect requirements.