Let me expand on that point: "Don't accidentally throw out good apples with the bad ones because you are looking at the wrong metrics."
What I mean is: Bad apples are real, but don't ever do time-tracking or fast response testing in an effort to identify them. There are some excellent apples who will get your 8h-day deliverables done in 2-4h. Don't ever establish any system to find them. If you have a problem with them, you are the problem.
Kick people based on repeatedly violating the deadline for deliverables.
What I mean is: Bad apples are real, but don't ever do time-tracking or fast response testing in an effort to identify them. There are some excellent apples who will get your 8h-day deliverables done in 2-4h. Don't ever establish any system to find them. If you have a problem with them, you are the problem.
Kick people based on repeatedly violating the deadline for deliverables.