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In this paper, we propose context-aware profiles and a filtering process for personalising informational content that is delivered to mobile users by Web-based information systems (WIS). The context-aware profiles allow mobile users to express their personal preferences for particular situations they encounter when using a WIS. We argue that the preferences and the needs of a mobile user may vary according to the context in which he uses the system. By defining these profiles, we propose a filtering process that takes into account both the user's current context and the user's preferences for this context. This process selects, in a first step, the context-aware profiles that match the user's current context, and then it filters the available informational content based on the selected profiles.