l Modeling of Context: As for the profile, identifying and orga- nizing contextual information are key issues in context modeling. The composite capabilities/preference profiles (CC/PP) standard [48] for composite capability/ preference profile defines the context as being device features. CC/PP is RDF based, it consists in three components (dimensions): terminal hardware, software, and browser. Each component consists in a set of predefined attributes (e.g., Personalization Paradigm in Service Delivery Platforms Terminall Hardware. display Width). The comprehensive structured context profile (CSCP) [17] is a more flexible standard for context modeling. CSCP is also RDF based, but unlike CC/PP, CSCP has no fixed hierarchy of dimensions and attri- butes: it allows expressing a more complex and general context. In our proposal, we identified five important dimensions: temporal, spatial, equipment, user state, and environment. Figure 10.2 gives a general overview of the context model. Detailed description can be found in [3]. The temporal dimension groups attributes related to the temporal aspect of the user interaction. It allows personalizing an application with respect to the moment of the user interaction. For example, one user may be interested in listening to music in the morning, and watching movies in the evening. To deal with various granularities, attributes are organized hierarchically (year, quarter, month, etc.). The spatial dimension constitutes one of the most important context characteris- tics. It encompasses all information that characterizes the place from which the users interact. Since users' interaction behaviors change with respect to their geospatial situation, we have enumerated two generic spatial situations: static and on move. Both of these situations may be described with a simple coordinate (e.g., GPS, address, etc.) and a locality label if the place is known (e.g., at home, in train). The equipment dimension characterizes the media used by the user to interact with the application. Thr