Trial Stage - By this point you should have tested candidates, interviewed them and have 2-3 candidates that you think might be a good fit. You might even have 1 candidate that you think is a winner and you want to hire that person right away, fight that urge.

Testing and an initial interview usually only accounts for 10% of the candidates overall fit for that position, that's why I suggest you try what I call 'real world interviewing'. You're going to take this person (I always suggest you try two or more) out for a day of work.

Track them using some kind of tracking software and give them the same tasks. The results almost always surprise you. I'll see some candidates that are quite quiet during an interview that work incredibly well and candidates who seem to have all the right answers during an interview work out horribly during this process. Once they've gone through the day look at both candidates and make your decision.