IQ is the single best indicator of how well someone CAN (not necessarily
will) perform in a modern work environment in any job other than pure
manual labor. That's why it's important.
Other things are important too. One must have a certain ability to think
ahead, to have a time-preference not rooted in the immediate, and one must
have the discipline needed to come to work every day and do the job. But
without IQ, it's irrelevant.
That's why IQ is early on the triage process: it's easy to test for, and
reliable to test for. Once you've weeded the low IQ people out other
problems become more tractable.
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