Abstract
Stellan Ohlsson proposed CBM in 1992 as a way to overcome some problems in student modeling. Since then, the approach has been extended and used in numerous intelligent tutoring systems, which we refer to as constraint-based tutors. CBM is now an established methodology for modeling instructional domains, representing students’ domain knowledge and also higher-level skills. Authoring support for constraint-based tutors is now available, as well as mature, well-tested deployment environments. We present CBM, its foundation and extensions, various types of instructional domains we applied it to, and conclude with avenues for future research.
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