Work out if the issue is worth fighting over.
Try to separate the problem from the person.
Try to cool off first if you feel too angry to talk calmly.
Keep in mind that the idea is to resolve the conflict, not win the argument.
Remember that the other party isn’t obliged to always agree with you on everything.
Define the problem and stick to the topic.
Respect the other person’s point of view by paying attention and listening.
Talk clearly and reasonably.
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Try to find points of common ground.
Agree to disagree.