International audienceThis article presents a multimodal observation method of older people discovering the use of a smart house and tactile and spoken interaction modes inside a Living Lab. Our observation is based on ethnographic and numerical methods. We highlight the impact of presentation of the different technologies on the change of mind, the preference for voice interaction and some brakes considered as far as the adoption of new technologies is concerned.Cet article présente une méthode d’observation multimodale de personnes seniors découvrant l’utilisation d’un environnement domotisé et les techniques d’interaction tactile et vocale en Living Lab. L’observation repose sur des méthodes ethnographiques et numériques. Nous soul...