Moment of zen: In the face of ambiguity, refuse the temptation to guess:
Figure 10.1: Moment of Zen
The temptation to guess, or to ignore ambiguity with wishful thinking, can lead to short term gains. But it can often lead to confusion in the future, and to bugs which are difficult to understand and fix. Before you make that next quick fix, ask yourself what information you need to do it correctly.