Gil,
Thank you for the links. Near the end of the second article
http://www.csdl.tamu.edu/~shipman/tois-hos.pdf was an interesting
passage:
"During the development of these systems, the need to support the
evolution of formal representations was reiterated. As the students
goals and understanding of the domains changed over the course of the
semester, so did the structure required to be formally represented.
Sometimes this meant adding new formalisms, but also this occasionally
resulted in the removal or modification of previous formalisms."
Removal of formalisms, some people might not like that at all.
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