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Principles vs Concepts or Classification Schemes

"Practically all classification schemes will improve our understanding of instructional phenomena, but concepts are not the kind of knowledge for which instructioal scientists are looking, except as a stepping stone. Instructional scientists want to determine when different methods should be used---they want to discover principles of instruction---so that they can prescribe optimal methods. But not all classification schemes are equally useful for forming highly reliable and broadly applicable principles." (Reigeluth, 1983, p. 12)
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