Mechanisms for Flexible Representation and Use of Knowledge in User Modeling Shell Systems
In many user modeling systems, assumptions about the user and other user modeling knowledge are represented in a knowledge base and used for individualized behavior of applications. Hence, user modeling shell systems need to support both representation and use of knowledge. Ideally, a shell provides powerful techniques for applications with sophisticated needs but is also flexible enough to be suitable for applications with specialized, less complex requirements. This paper describes two mechanisms that were developed for increasing the flexibility of user modeling shell systems: the AsTRa (Assumption Type Representation) framework for powerful and flexible logic-based representation of user modeling knowledge; and domain-based user modeling, which allows modularization and sharing of user modeling knowledge bases particularly in centralized user modeling scenarios. Both mechanisms have been implemented in the user modeling shell BGP-MS.
KeywordsUser Modeling View Content Assumption Type Assumption Logic Flexible Representation
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