Parties solve the problems by negotiation process to remove their mental disorder. We can say that negotiation is cause of mentally satisfaction.

1.       It is reality and human nature that, from time-to-time, conflict and disagreement will arise among the parties for their own interests and their own needs.  Without negotiation, such conflicts will make more critical which will harmful for both parties. The main focus of negotiation is to trying to reach agreements by avoiding from conflicts in future. Parties solve the problems by negotiation process to remove their mental disorder. We can say that negotiation is cause of mentally satisfaction.