“…The limitation of the existing approaches is that they are not global, being bounded to specific application fields or specific aspects of the context. So, in the frame of the AMBIT (Algorithms and Models for Building context-dependent Information delivery Tools) project 3 we have defined a model of user profile that aims at being more global than existing ones [8,13]; this model is composed of the following components: Environment parameters, which is a set of external conditions surrounding the user while performing activities (e.g., using an application); Personal parameters, which contain the essential data about the user's profile (e.g. name, gender, age, nationality), which are usually set by the user during the configuration of the application or the service; History parameters, which record past actions of the users, in order to have a more complete picture of the user itself.…”