Why Testing Gray Matter Is Sometimes a Gray Area

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Kevin McGrew, Director of the Institute for Applied Psychometrics and a co-author of the Woodcock-Johnson Battery III and IV IQ tests says that student performance on the best available IQ tests is correlated with academic success, but he notes that even the best tests explain only about 40% to 50% of school achievement. That means 50% to 60% is not related to cognitive ability. Although no one discounts the importance of raw intelligence, it turns out that qualities such as motivation, determination and a desire to succeed–qualities that IQ tests don’t measure–play a significant role in success. Thomas Edison once summed it up like this: Genius, he said, is 1% inspiration and 99% perspiration. McGinty, Jo Craven. (2016, August 6). “Why Testing Gray Matter Is Sometimes a Gray Area.” Wall Street Journal, The Numbers┬áp.A2

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