Hiring the right person for a given job can be a bit of a craps shoot for many business owners — and for some HR managers as well. It seems obvious that the most important things you want to answer are whether they can do the job and whether they fit into your team. But those are not paramount.
Guessing again? Integrity, intelligence, suitability to your “fast-paced environment”, expertise, ambition, work ethic… all are plausible guesses about what the most important factor might be in a potential hire. And certainly, most of these are important factors, but none of them are critical for the interview. I’m assuming, of course, that you aren’t going to make people fill out some inane aptitude test or issue some irrelevant quiz about what kind of tree they’d most like to be.