Let your needs drive the questions you ask your job interviewer. This is a guest post by Judi Perkins. If you’d also like to guest post here on JobMob, follow these guest post guidelines. Why do companies ask you why you left your previous jobs? Why are they concerned if you’ve had few in a short time? They want to make sure if they invest in you that you will stay and not split for the next passing ship, for whatever reason seems to make sense to you at the time. They ask because previous behavior, unless given a plausible reason to believe differently, is an indicator of current and future behavior.