enabling the system to hypothesize semantic relationships among (graphi-
cal) objects.
5° 7 Another Application Scenario
One peculiarity of the TrIAs scenario was the exchange of the roles as ser-
vice provider and consumer between user and system. This made it neces-
sary to consider carefully the user's "felicity" (in contrast to concentrating
exclusively on the learner's state as described in VanLehn 1987).
However, not only applications in which a (possibly unwilling) user
happens to be involved in a training session benefit from the careful de-
sign of their
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