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.
Don't rely exclusively on the candidate for information about their track record: Talk to believable people who know them, look for documented evidence, and ask for past reviews from their bosses, subordinates, and peers. As much as possible, you want to get a clear and objective picture of the path that they have chosen for themselves and how they have evolved along the way. I've seen plenty of people who claimed to be successful elsewhere operate ineffectively at Bridgewater. A closer look often revealed that they were either not as successful as they portrayed themselves or they got credit for others' accomplishments.