While these principles are good general rules, it’s important to remember that every rule has exceptions and that no set of rules can ever substitute for common sense. Think of these principles as being like a GPS. A GPS helps you get where you’re going, but if you follow it blindly off a bridge—well, that would be your fault, not the GPS’s. And just as a GPS that gives bad directions can be fixed by updating its software, it’s important to raise and discuss exceptions to the principles as they occur so they can evolve and improve over time.