Choosing employees is part science, part art. And, even then, it's a while before you know whether you've made the right choice.
At Tailored Management all we do, all day long, in all our locations is read people and make choices. We've gotten pretty good at it. But just to be sure, we keep employees on our payroll for a set period - six months, a year, longer - until all their strengths and weaknesses are revealed. So far, we have an excellent track record of picking top quality people, but the point is, you know ahead of time before you make any firm decisions.