Principles are ways of successfully dealing with reality to get what you want out of life.
Ray Dalio, one of the world’s most successful investors and entrepreneurs, cites principles as his key to success.
Like a ski instructor, you need to have close contact with your people on the slopes so that you can assess their strengths and weaknesses as they are doing their jobs. There should be a good back-and-forth as they learn by trial and error. With time you will be able to decide what they can and can't handle on their own.