  This paper is concerned with the design and implementation of an innovative
user support system in the frame of an open educational environment. The
environment adapted is ModelsCreator (MC), an educational system supporting
learning through modelling activities. The pupils typical interaction with the
system was modelled us-ing Bayesian Belief Networks (BBN). This model has been
used in ModelsCreator to build an adaptive help system providing the most
useful guidelines according to the current state of interaction. A brief
description of the system and an overview of application of Bayesian techniques
to educational systems is presented together with discussion about the process
of building of the Bayesian Network derived from actual student interaction
data. A preliminary evaluation of the developed prototype indicates that the
proposed approach produces systems with promising performance.
