Once a negotiation process begins, during its earliest phase we should include the other party in a problem-solving session to identify alternative outcomes. this technique is called: inclusive brainstorming. identifying shared interests. objective criteria. broadening options.

The answer to this question is inclusive brainstorming.
inclusive brainstorming. refers to the type of brainstorming that tried to brought out each individual strength that possesed by each members involved.
By doing this , we will able to consider all perspective and make the best possible decision for all parties.