Final answer:
The most difficult step in the integrative negotiation process is building trust and crafting a shared vision, due to challenges such as transaction and conformity costs and the need for good faith collaboration.
Step-by-step explanation:
The integrative negotiation process involves various steps that are aimed at finding a win-win solution for all parties involved. It requires identifying common interests, problem-solving, and collaboration to achieve a mutually beneficial outcome. However, among these steps, the most difficult is often considered to be building trust and crafting a shared vision. This difficulty arises because it necessitates finding commonalities, adapting to unexpected circumstances, and ensuring that all voices are centered and raised during the negotiation. It is also where transaction and conformity costs can present challenges, requiring negotiators of good faith to come together to confront and overcome these issues for successful coordination.