The best managers know how to frame work as a problem that is a lot of work to complete and a small amount of work to check. Mediocre managers spend too much time checking and revising their employees' work, and begin to approach the cost of just doing it themselves. (The worst managers hire incompetent people.) Wolfram Alpha made me this cute Venn diagram of the sweet spot: Competent (C) and not Micromanaged (M). Teams led by good managers reside in the shaded area of the diagram.
