Moving Towards Life-Long User Modeling

User modeling is the core component for the majority of personalization services. It has become an important factor in the effort to personalize a diversity of Web resources according to userspsila characteristics and needs. While trying to move a step further and model dynamic users in a range of contexts, life-long user modeling, the ability to model a dynamic and changing user throughout lifetime interactions with a variety of resource providers, appears to be an attractive solution. A scrutable user modeling infrastructure is proposed in this paper, where a first prototype has already been designed and implemented, which blends together some key user modeling dasiaingredientspsila- interoperability, scrutability, user privacy - and attempts to model the various life-long user interactions with a diversity of Web-based systems from the educational, business and social networking domains.