. . , - . . , . , Journal of Applied Psychology (. . ) 20 , . . . , , . . . ., , . . . , , . , . . , , . 20 .
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(law of parsimony)
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, - . . , - . . -, , . . . , . . , . . , . , - (., ), . . , , ., . , . (., , Head Start). , . , - . . , , , , , . . , , ( ), , , ., .-. (National Research Council, NRC).
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