UNCERTAINTY PROCESSING IN USER-MODELING ACTIVITY

In this paper we investigate the role of a new algebraic fuzzy structu re as dynamic model to represent user's states during navigation in a multimedia tutoring system. The structure can be profitably utilized t o monitor the evolution of mental states in order to suit the resource s and the didactic strategies to the user's needs. The problem of buil ding a user model is favourably affected by our approach: in fact the huge quantities of data present in overlay and bug catalogue models ar e no longer required. The fuzzy structure allows to monitor the cognit ive variables that are necessary to design a user model that can opera te in a way independent from the particular topic to be taught. (C) 19 98 Elsevier Science Inc. All rights reserved.