The Problem with Taking Positions at Face Value
When a counterpart says "we need 30-day payment terms," they're stating a position. Positions are outputs — they strip away all the context, reasoning, and underlying need that generated them. Negotiating on positions is like reading the last page of a mystery novel and thinking you understand the story.
What "Interests" Actually Means
An interest is the need, desire, fear, or constraint that produced a position. It's the *why* behind the *what*.
A vendor who insists on net-15 payment terms may have an interest in cash flow predictability. Or they may have an interest in reducing accounts receivable risk. Or a cash crunch in their own business. Each generates the same position but leads to completely different solutions.
Three Layers of Interests
Substantive interests are the concrete outcomes the other party cares about: money, time, resources, deliverables.
Process interests are preferences about *how* the negotiation happens: being consulted, being treated with respect.
Relationship interests reflect what the other party wants from the ongoing relationship: trust, reliability, recognition.
Techniques for Surfacing Interests
Ask "why" — carefully. "Help me understand the concern behind the 30-day requirement — is it primarily about cash flow, or is there something else driving it?"
Ask "what matters most." "Out of everything we're discussing today, what matters most to you?" The answer almost always reveals an interest more clearly than any amount of back-and-forth.
Use hypotheticals. "If the payment timing weren't an issue, would the rest of the terms work for you?" Hypotheticals let people respond to interests without committing to positions.
Share your own interests first. When you explain your interests openly, the other party is much more likely to do the same.
The Mapping Exercise
Before important negotiations, build an interest map:
List your own interests — not your positions
Estimate their interests based on everything you know
Identify overlapping interests — where you both want the same thing
Identify complementary interests — where your wants are different but compatible
Identify competing interests — where gains for one come at cost to the other