Science and Human Behavior, Chapter 13: Function versus Aspect, Quote 4

“A test is simply a convenient opportunity to observe behavior—to survey or sample our dependent variable. The score may be used to predict some aspect of the larger universe of behavior from which the test is drawn . . . Certain variables in the history of the individual and in the current environment are  responsible for the behavior in the test situation, and they also determine the behavior in the larger situation. The prediction is not from cause to effect, but from one effect to another.” (p. 199)

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