Here are the behaviors that could indicate a top performer has one foot out the door:

1. Change in attitude – For example, a top team player might withdraw and stop helping others.
2. Sloppiness – Formerly top-notch employees will make more errors when they know they’re leaving.
3. Solitude – The employee might start to distance himself from others, for example, by eating lunch alone.
4. More absences – Workers headed for the door will take “sick days” to attend interviews.
5. Formal attire – Employees will also use lunch to go to interviews, which normally will require them to dress nicer than usual.
6. Increased Web use – Departing workers are less inclined to do actual work, and they’ll spend a lot of time on online job boards.