Unfortunately I.T.S. are to be found mainly in research laboratories, not in classrooms! The reason for this is that their design is very difficult, especially on university level topics.
In TELECOM-Paris we are trying to design another type of intelligent teaching aid which should be considered rather as a critic than as a tutor. This approach should be indeed more appropriate in a university context where students are able to learn mostly by themselves, but need specific help when experiencing a particular problem (conceptual puzzle, abnormal behavior of some device, repeated failure).