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.
Think of yourself as a chef and taste the soup before it goes out to the customers. Is it too salty or too bland? Managers need to do that too, or have someone in their machine do it for them, for every outcome they're responsible for. People who are delegated this task are called "taste testers."