It's easy. Are you complete with your work? Yes? Then you have been inconsistent. Does that statement hold true throughout? I really hope not. In design, however, it holds up well and is a good lesson to keep in mind. Also becomes it implies that you are never done in design if you have been consistent, which is a sad truth (there is always more you can do).
Keys: when is a project done, integration of systems, iteration of systems, alternate perspectives of design