There is nothing quite so useless as doing with great efficiency something that should not be done at all. —PETER DRUCKER There are a lot of productivity systems that help us create lists, but few encourage us to reengage with them. By hoarding tasks, our lists quickly become endless and unmanageable, leaving us feeling overwhelmed or demotivated. It’s easy to forget that just because something could be done does not mean that it should be done.