Evolution of dynamic user models for adaptive educational hypermedia system (AEHS)

The Internet and the web change many human life aspects including education. The web provides new means for delivering educational material, so the concepts of e-learning and distance learning have evolved. The web technologies are tailored to personalize learning process which results in what is known as Adaptive Educational Hypermedia Systems (AEHS). AEHS constitutes three basic modules, the content module, the adaptation module and the user module. The user module is the heart of the system, based on which the adaptation module personalize the content. A User models in AEHS is either static, i.e the information about the user characteristics is collected and updated before starting the adaptation or in habitual intervals, or dynamic where the user information is updated continuously as the user interact with the system. In this paper we surveys systems that employ dynamic user models and research work that proposes a dynamic user mode, to determines the evolution of user characteristics that have been involved in building dynamic user models during the last decades.