Work with your team to define rules about how to have a contentious discussion. Whenever necessary, revisit the rules and remind people to follow them. The rules teams develop vary from team to team, but some examples might include the following:
• "Wait for another person to finish speaking before jumping into the conversation."
• "Acknowledge the value of another person's idea, even if you don't agree with it."
• "If you disagree with someone, explain the reasons behind your position.