1. Allen, J.F. and Perrault, C.R.: Analyzing intention in dialogues, Artificial Intelligence, 15, 3, 143–178 (1980).
2. Anderson, J.R.: The architecture of cognition. Cambridge, Massachusetts: Harvard University Press 1983.
3. Anderson, J.R., Boyle, CF., and Yost, G.: The geometry tutor. Proceedings of the Ninth International Joint Conference on Artificial Intelligence, pp. 1–7, Los Angeles, California 1985.
4. Anderson, J.R. and Reiser, B J.: The LISP tutor. Byte, 10, 4, 159–175 (1985).
5. Baril, D.: Applying qualitative reasoning to student modelling in an intelligent tutoring system, M.Sc. Thesis, Department of Computational Science, University of Saskatchewan, Saskatoon, Canada forthcoming.