Object-Oriented Knowledge Primitives for Intelligent Tutoring Shell

The difficulty of designing and developing intelligent tutoring systems (ITSs) has caused a recent increase in the interest of the AI researchers in realisation some new approaches in that field. On the other hand, the educational communities have become also interested in taking an active role in designing educational software. However, the advancement of AI methods and techniques makes understanding of ITSs more difficult, so that the teachers are less and less prepared to accept and understand these systems. The paper describes an objectoriented model of ITSs shell, called EduSof, in which the enduser (teacher) could alone make their own ITSs lessons. The model enables the developing more flexible software environments for building ITSs, significantly increasing their reusability. The processes of computer-based tutoring and learning based on this model are much closer to human-based instruction. The model can be easily extended to cover the needs of particular tutoring systems.