One view of negotiation involves three basic elements: "process", "behavior" and "substance". The process refers to how the parties negotiate: the context of the negotiations, the parties to the negotiations, the tactics used by the parties, and the sequence and stages in which all of these play out. Behavior refers to the relationships among these parties, the communication between them and the styles they adopt. The substance refers to what the parties negotiate over: the agenda, the issues (positions and – more helpfully – interests), the options, and the agreement(s) reached at the end.