This is the most important step of all. You must manage contractors as if they work for you because they do. The good news is that if you have followed the previous five steps, the chances are you have selected a competent and agreeable contractor, and that you and he have already communicated extensively about your expectations. If you don’t like the way something is done, let them know and discuss how it can be fixed or redone. If they understand that you are managing the project carefully and that you care about quality they will be far less likely to cut corners.