An employee in your company makes a careless mistake that costs you business. This can be exactly what you spend so much time and effort trying to avoid. Or, with a shift in perception, it can be exactly what you were looking for--the chance to pierce through defenses and teach a lesson that can be learned only by experience. A mistake becomes training. Again, the event is the same: Someone messed up. But the evaluation and the outcome are different. With one approach you took advantage; with the other you succumbed to anger or fear.