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.
If they don't, there's no purpose to them. At a minimum, a diagnosis should take the form of theories about root causes and clarity about what information needs to be gathered to find out more. At best, it should lead directly to a plan or design to fix the problem or problems.