Dan and I recently decided to initiate a 3x ask rule internally. We recently waxed on how one task that we requested originally 1.5 years ago was not completed. Now regardless the excuses, delegation does not work if the person you ask to do something does not do it.
More to the point if its ultimately your responsibility, your the one who relatively did not complete the task. We want to try to initiate this policy without too much emotion like "BLAME" attached to this process either.
Many of the people that we work with us have gone through hell and back and so questioning their loyalty or intent is not the issue
If it's not done by the third request we reassign or do the task ourselves.