_________ is a technique used to uncover underlying interests and needs during a negotiation.

Interest-based bargaining, also known as principled negotiation or integrative negotiation, is a technique used to uncover underlying interests and needs during a negotiation. Instead of focusing solely on positions or demands, this approach encourages parties to identify and address the underlying concerns and priorities to reach mutually beneficial agreements. By understanding each other's interests, negotiators can find creative solutions that satisfy all parties involved.