Interviewing is a horribly inexact science.

You just can’t know how well someone will perform in a role until they’ve actually had a chance to do it.

So be careful not to set up a hiring process so rigid and exacting that it guarantees you only hire great people. Not only will you slow your hiring to a crawl, but you’ll have certainly turned away dozens of people who would have been amazing - had you only given them the chance to show you that they could be.