Conflict is about goals, not people.
Most cross-team conflict comes from different goals and pressures. Make those visible and the argument usually changes shape.
Name the shared goal
What do both teams ultimately want for the customer?
Surface constraints
What pressures and targets is each team under?
Positions vs interests
“We need X” hides a reason. Find the reason.
Agree criteria, then decide
Decide how to choose before choosing.
Source: Program on Negotiation, Harvard Law School ↗
Separate the people from the problem.