\'Etude des dimensions sp\'ecifiques du contexte dans un syst\`eme de filtrage d'informations

In the context of business information systems, e-commerce and access to knowledge, the relevance of the information provided to use is a key fact to the success of information systems. Therefore the quality of access is determined by access to the right information at the right time, at the right place. In this context, it is important to consider the users needs when access to information and his contextual situation in order to provide relevant information, tailored to their needs and context use. In what follows we describe the prelude to a project that tries to combine all of these needs to improve information systems.