What is really most concerning about these studies is that the intervention too resembles the metric in order to believe they don&#x27;t teach to the test. It&#x27;s like treating depression by teaching people how to lie to psychiatrists. If you&#x27;re measuring intelligence by performance on little 10-minute puzzles, and you show an improvement by teaching people to solve puzzles, I&#x27;m not really impressed. If you show an improvement in puzzles by teaching people guitar, giving them a drug, or sending them to basic training, I&#x27;ll invest in your company. On the other hand, if you measure intelligence by job performance or some other life measure, and you show an improvement with puzzle games, it doesn&#x27;t seem quite so unfair.