http://psycnet.apa.org/journals/psp/86/1/162/ http://psycnet.apa.org/journals/psp/86/1/162/ "Synthesizing evidence from nearly a century of empirical studies,

http://psycnet.apa.org/journals/psp/86/1/162/ http://psycnet.apa.org/journals/psp/86/1/162/ "Synthesizing evidence from nearly a century of empirical studies, Schmidt and Hunter established that general mental ability—the psychological trait that IQ scores reflect—is the single best predictor of job training success, and that it accounts for differences in job performance even in workers with more than a decade of experience. It’s more predictive than interests, personality, reference checks, and interview performance. Smart people don’t just make better mathematicians, as Brooks observed—they make better managers, clerks, salespeople, service workers, vehicle operators, and soldiers."