In this article, integrative bargaining (also called "interest-based bargaining," "win-win bargaining") is a negotiation strategy in which parties collaborate to find a "win-win" solution to their dispute. This strategy focuses on developing mutually beneficial agreements based on the interests of the disputants. Interests include the needs, desires, concerns, and fears important to each side. They are the underlying reasons why people become involved in a conflict.
Integrative refers to the potential for the parties' interests to be [combined] in ways that create joint value or enlarge the pie."
Potential for integration only exists when there are multiple issues involved ...