Communication is essential for any successful negotiation, particularly when dealing with interdepartmental conflicts. It is important to communicate in a respectful, clear, and constructive way. To do this, you should listen actively to the other party by paying attention to what they are saying and showing interest and empathy. Ask open-ended questions, paraphrase, and summarize to check your understanding and demonstrate that their feelings are heard. Additionally, express yourself assertively by stating your position, interests, and needs in a confident and respectful manner. Use "I" statements, avoid blaming or accusing, and provide facts and examples to back up your point. When resolving the conflict, focus on the problem rather than the person by avoiding personal attacks or judgments that can worsen the situation. Instead, focus on relevant facts, issues, and behaviors pertaining to the problem. Finally, seek common ground by identifying areas of agreement, shared values, and mutual goals that can help build rapport and trust with the other party. Emphasize the benefits of working together towards a win-win solution.