Congrès sous l’égide de la Société Française de Génie Biologique et Médical (SFGBM).National audienceAmbient assisted living is become an essential concept to design suited solutions to keep people at home with safety conditions. In this way, many innovative technologies based on information communication technologies (ICT) have been proposed recently. An interesting and promising research way would be to explore a new design of interaction in con-nection with ambient wireless sensors. In this article we describe how a Wizard of Oz platform (called MIOZ) works with a wireless sensors network to acquire data from the behavior of the user. The principle is illustrated through a real scenario