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The aim of this article is to present and discuss selected commercial user modeling systems against the background of deployment requirements in real-world environments. Following the recent trend towards personalization on the World Wide Web, these systems are mainly aimed at supporting e-commerce including customer relationship management. In order to(More)
Due to the tremendously increasing popularity of the WorldWide Web, hypermedia is going to be the leading online information medium for some years to come and will most likely become the standard gateway for citizens to the " information highway ". Already today, visitors of web sites are generally heterogeneous and have different needs, and this is likely(More)
The tremendously increasing popularity of the World Wide Web indicates that hypermedia is going to be the leading online information medium for the years to come and will most likely be the standard gateway to the " information highway ". Visitors of web sites are generally heterogeneous and have different needs, and this trend is likely even to increase in(More)
Representation components of user modeling servers have been traditionally based on simple file structures and database systems. We propose directory systems as an alternative, which offer numerous advantages over the more traditional approaches: international vendor-independent standardization, demonstrated performance and scalability, dynamic and(More)
Several current support systems for travel and tourism are aimed at providing information in a personalized manner, taking users' interests and preferences into account. In this vein, personalized systems observe users' behavior and, based thereon, make generalizations and predictions about them. This article describes a user modeling server that offers(More)
Visitors of web sites are generally heterogeneous and have different needs. The aim of the AVANTI project is to cater to these individual needs by adapting the content and the presentation of web pages to each individual user. The special needs of elderly and handicapped users are also partly considered. A model of the characteristics of user groups and(More)
The N24 Web site [6] belongs to a network of sites operated by Kirch Group that complement associated television stations in Germany. The relaunch of the N24 site focuses on tighter integration with the N24 cable news brand, targeting managers in need of accurate real-time information delivery in the areas of investing, business, politics, and sports. The(More)
This paper first describes the hypertext system KN-AHS which adapts to users' presumed domain knowledge, and discusses the support that the user modeling shell system BGP-MS can provide for this adaptation. The aim of constructing KN-AHS was to demonstrate the feasibility of user modeling with BGP-MS in a " normal " hardware and software environment that is(More)
Users of publicly accessible information systems are generally heterogeneous and have different needs. The aim of the AVANTI project is to cater to these individual needs by adapting the user interface and the content and presentation of WWW pages to each individual user. The special needs of elderly and handicapped users are also partly considered. A model(More)