A position is what someone says they want; an interest is the need, risk, value, or constraint behind it. Two teams arguing over a deadline may actually be protecting different interests such as customer commitment, quality, workload, or revenue timing. Understanding interests creates more options than trading demands alone.
Prepare your preferred outcome, minimum acceptable conditions, best alternative if no agreement is reached, and decision authority. During negotiation, exchange information carefully, use objective criteria where possible, and create packages across scope, time, cost, quality, and support. A final agreement should name owners, dates, dependencies, measures, and what happens if assumptions change.