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Prescriptive Theories Cannot Be Automatically Derived from Descriptive Theories

Landa (1983) states that "prescriptive instructional theories cannot be automatically derived from descriptive instructional theories." He gives an example to illustrate why this isn't so:

"Suppose we have a descriptive proposition: 'If a student repeats a statement many times, he or she memorizes it better." This is a 100 percent true proposition. Let us convert it into a prescriptive proposition: 'In order to memorize a statement better, one has to repeat it many times.' This proposition is not as true as the first one because the state of 'memorized' is determined by many factors, not just repetition. For example, for a particular student to memorize a statement, it may be more important to understand it rather than just mechanically repeat it. Some students, due to the specific characteristics of their memory, the personal significance of the proposition for them, and some other factors, may not need to repeat it at all." [p. 60]

He notes that the same is true for learning theories.
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