The recent development of communication networks and multimedia system provides users with the availability of a huge amount of information making worse the problem of information overload [9]. The evolution of system design is necessary becoming more user centred, and more personally involving. A review of survey studies on Internet users since 1993 confirms that a greater percentage of people are becoming online citizens, and professionals are integrating more online components into their work process. A review of the experimental literature on Internet user's reveals that there is intense interest in humanising the online environment by integrating affective and cognitive components [8].