To successfully conclude the agreement every negotiator must be familiar with the concept of power. Every person has the power, but it is important to know how to use and dispose with power that one possess. Will the negotiation be successful depends entirely on the person and his knowledge about power, of the efficient use of power and adjusting it's power with the other side's power. The power can best be measured through the use of methods, or aggressive methods in the case of distributive negotiation or even those methods that help the negotiator to accomplish it's objectives which will not be to the detriment of the other side, integrative negotiation. Each negotiator should know the strategy of penetrating the negotiation, i.e., the five basic principles of negotiation as a guidelines of a successful negotiation. Furthermore it enables achieving negotiation that will meet the interests of both sides by turning the hard opponent to the actual partner.