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.
You must always be simultaneously trying to accomplish the goal and evaluating the machine (the people and the design), as all outcomes are reflections of how the machine is running. Whenever you identify a problem with your machine, you need to diagnose whether it is the result of a flaw in its design or in the way your people are handling their responsibilities.
Sample size is important. Any problem can be a one-off imperfection or a symptom of root causes that will show up as problems repeatedly. If you look at enough problems, which one it is will become clear.