FUZZY MANAGEMENT OF USER ACTIONS DURING HYPERMEDIA NAVIGATION

The recent dramatic advances in the field of multimedia systems has ma de practicable the development of an Intelligent Tutoring Multimedia ( ITM): In these systems are present hypertextual structures that belong to the class of hypermedia systems. ITM development involves the defi nition of a suitable navigation model in addition to the other modules of an Intelligent Tutoring System (ITS), i.e. Database module, User m odule, Interface module, Teaching module. The navigation module receiv es as inputs the state of the system and the user's current assessment and tries to optimize the fruition of the knowledge base. Moreover, t his module is responsible for managing the effects of disorientation a nd cognitive overhead. In this paper we deal essentially with four top ics: (i) to define a fuzzy-based user model able to manage adequately the user's cognitive state, the orientation, and the cognitive overhea d; (ii) to introduce fuzzy tools within the navigation module in order to carry out moves on the grounds of meaningful data; (iii) to define a set of functions that can dynamically infer new states concerning u ser's interests; (iv) to classify the hypermedia actions according to their semantics. (C) 1998 Elsevier Science Inc. All rights reserved.