Solving complex physics problems requires some kind of knowledge for
selecting appropriate applications of physics principles. This
knowledge is tacit,
in that it is not explicitly taught in textbooks, existing tutoring
systems
or anywhere else. Experts seem to have acquired it via implicit
learning
and may not be aware of it. Andes is a coach for physics problem
solving
that has had good evaluations, but still does not teach complex problem
solving
as well as we would like. The conventional ITS approach to
increasing
its effectiveness requires teaching the tacit knowledge explicitly, and
yet
this would cause Andes to be more invasive. In particular, the
textbooks
and instructors would have to make space in an already packed
curriculum
for teaching the tacit knowledge. This paper discusses our
attempts
to teach the tacit knowledge without making Andes more invasive.
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