I enjoyed reading Negotiating the Impossible, Second Edition: How to Break Deadlocks and Resolve Ugly Conflicts because it provided three key pillars to successful negotiations: first, the power of framing; second, the power of process; and third, the power of empathy.
Framing is important because it sets the structure of the negotiations. The frame influences how people perceive each other, the issues and challenges, possible options or solutions. What I found interesting is that sometimes having an ambiguous frame is helpful for both parties to move forward.
Process is always key to almost any endeavor, and negotiations are no exception. Typically, the parties to the negotiations want to agree on how they will get from their present positions to where they have reached an agreement. Implementation is also key.
Empathy is key to resolving any conflict or negotiation. Empathy, however, should not be confused with sympathy. Empathy is understanding your counterpart’s view of the situation. If you do not understand your counterpart’s view, then it will be more difficult to use your creativity to craft a solution that will be acceptable to all.
I highly recommend Deepak Malhotra’s book Negotiating the Impossible.