With the "hard sphere negotiations" Club

In do PTT course presentation for graduation, my topic is "towards the success of the hard sphere negotiations", the result was the teacher strongly questioned. Questioning is the core of hard sphere negotiations can win? The teacher said, if this is really the subject used in training, will be all kinds of difficult problems raised by participants stumped. The face of the teacher's question, I also lost in thought, hard negotiations actually can win? The hard sphere negotiations on what win? Use sales targets regardless of win-win negotiation or hard negotiations, since called negotiation, then the negotiations between the two sides is holding fight for their own interests of thinking, when involves the interests of the who would not give in easily.