Sometimes, vendor changes may require negotiation between you and your vendor, especially if they involve significant changes in scope, budget, timeline, or quality. Negotiation is a skill that requires tact, diplomacy, and mutual respect. You should strive for a win-win outcome that satisfies both parties' interests and goals, while maintaining a positive and professional relationship. To ensure successful negotiation, it is best to prepare and research before the negotiation, such as the rationale, impact, and alternatives for the change. Listening and empathizing with your vendor's point of view is also important. Focus on the interests and benefits of both parties rather than their positions or demands. Utilize objective criteria and data to support your arguments and proposals; such as industry standards, benchmarks, or best practices. Additionally, explore options and trade-offs that can create value for both parties. Finally, seek agreement and commitment on the final terms and conditions of the change; document them in a change order or revised contract or SOW. Negotiating changes fairly and respectfully will help you and your vendor build trust, rapport, and loyalty; fostering a long-term strategic partnership.