Roger Fisher and William Ury, two Harvard law professors, have done some outstanding work in what they call the âprincipledâ approach versus the âpositionalâ approach to bargaining in their tremendously useful and insightful book, Getting to Yes. Although the words Win/Win are not used, the spirit and underlying philosophy of the book are in harmony with the Win/Win approach. They suggest that the essence of principled negotiation is to separate the person from the problem, to focus on interests and not on positions, to invent options for mutual gain, and to insist on objective criteriaâsome external standard or principle that both parties can buy into.