The answer to the question “What needs to be done?” almost always contains more than one urgent task. But effective executives do not splinter themselves. They concentrate on one task if at all possible. If they are among those people—a sizable minority—who work best with a change of pace in their working day, they pick two tasks. I have never encountered an executive who remains effective while tackling more than two tasks at a time.
- From “The Effective Executive: The Definitive Guide to Getting the Right Things Done”
by Peter F. Drucker