The notion of context is fundamental to the field of pervasive computing, and in particular when such services are dedicated to assist a user in his daily activities. Being at the crossroad of various fields, a context-aware home dedicated to aging in place involves a variety of stakeholders to design and develop assistive services, as well as to deploy and maintain the underlying infrastructure. This considerable diversity of stakeholders raises correspondingly diverse context dimensions : each service relies on specific contexts (e.g., sensor status for a maintenance service, fridge usage for a meal activity recognition service). Typically, these contexts are considered separately, preventing any synergy. This dissertation presents a meth...