Negotiation skills involve reaching agreements between parties who want something from each other. The document discusses definitions of negotiation, decision making tools like persuasion and problem solving, negotiating behaviors like red (aggressive) and blue (cooperative), and the four phases of negotiation: plan, debate, propose, and bargain. Effective negotiators understand different behaviors, plan their objectives and options, listen to other perspectives, make reasoned proposals while leaving room for agreement, and make strategic concessions to reach a compromise.