The surgeon who only takes out half the tonsils or half the appendix risks as much infection or shock as if he did the whole job. And he has not cured the condition, has indeed made it worse. He either operates or he doesn’t. Similarly, the effective decision-maker either acts or he doesn’t acts. He does not take half-action. This is the one thing that is always wrong, and the one sure way not to satisfy the minimum specifications, the minimum boundary conditions.
-Peter F. Drucker, The Effective Executive