Original sentence: Members of the Harvard Negotiation Project, Fisher and Ulry focused on the psychology of negotiation, finding acceptable compromise by determining which needs are fixed and which flexible for negotiators
Edited sentence: By 1987, the book had been adopted in several school districts to help students understand "non-adversarial bargaining".Members of the Harvard Negotiation Project, Fisher and Ulry focused on the psychology of negotiation in their method, "principled negotations", finding acceptable compromise by determining which needs are fixed and which flexible for negotiators