A task is not done until it is done.
(Louis Fried, 1992)

I've lost count of the times I've sat in status update meetings to hear the project manager run through a list of partially completed tasks. A task that's 60 percent complete is no-good to anyone. It's not finished, whether 10, 50 or 95 percent complete. Tasks are either complete or incomplete, and this is all that needs reporting. Remember, nearly there is not there.