Separate the people from the problem

Be hard on the problem, soft on the people — attack the issue, not each other.

Why it works

Negotiations entangle the substance with the relationship, so a disagreement on the merits gets felt as a personal attack and triggers defensiveness. Deliberately separating the two lets you press hard on the issue while protecting the relationship that makes agreement possible — emotions and perceptions handled as their own track.

How to do it

1. Name and address emotions and misperceptions explicitly before the substance.
2. Sit on the same side of the table figuratively: "us vs the problem," not "me vs you."
3. Critique proposals, never the person; let them save face.

Evidence

Core Harvard-method principle, consistent with well-established psychology of conflict, defensiveness, and perspective-taking. It is framework guidance, not a tested protocol. (mechanistic)

The relationship/substance split is a reasoning tool; the underlying emotion and perspective-taking findings are what carry empirical weight.

Common mistake

Letting a tough stance on the issue read as hostility toward the person, which turns a solvable problem into a status fight.