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.
When you reach an agreement, it's a good sign you've arrived at truth, which is why getting to that point is such a great achievement. This is one of the main reasons that the person being evaluated must be an equal participant in the process. When you do agree, make a formal record of it. This information will be a critical building block for future success.