Getting to Yes – Roger Fisher, William Ury & Bruce Patton

A cornerstone of the Harvard Negotiation Project, this book introduced the world to "principled negotiation." Instead of positional bargaining where one side wins and the other loses, the authors suggest focusing on interests, generating multiple options for mutual gain, and using objective criteria. It provides a universal framework for resolving conflicts and reaching "win-win" agreements in both professional business settings and personal relationships.