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Definition //
Ill-Stuctured Domain
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Spiro, Feltovich, Jacobson, & Coulson (1995) define an "ill-structured domain" as follows: 

An ill-structured knowledge domain is one in which the following two properties hold: (1) each case or example of knowledge application typically involves the simultaneous interactive involvement of multiple, wide-application conceptual structures (multiple schemas, perspectives, organizational principles, and so on) . . . and (2) the pattern of conceptual incidence and interaction varies substantially across cases nominally of the same type (i.e., the domain involves across-case irregularity). (p. 92 [print], ¶ 8 [electronic])

Reference

Spiro, R. J., Feltovich, P. J., Jacobson, M. I., & Coulson, R. L. (1995). Cognitive flexibility, constructivism, and hypertext: Random access instruction for advanced knowledge acquisition in ill-structured domains.  In L. P. Steffe & J. E. Gale (Eds.), Constructivism in education (pp. 85-107). Mahwah, NJ: Lawrence Erlbaum Associates. Retrieved July 30, 2002, from http://www.ilt.columbia.edu/ilt/papers/Spiro.html