A discussion becomes harder to use when a proposal turns into a judgement about the person suggesting it. You may feel strongly and still have a specific objection that can be examined.
State the part of the plan that concerns you. Give the relevant information or uncertainty, then ask how it could be addressed. If you propose another option, explain which problem it answers.
Make the decision visible
Agree on what the conversation needs to decide and who has responsibility for it. Some disagreements can be resolved by checking a fact; others concern different priorities that need an explicit choice.
If the exchange becomes heated, suggest a pause or another suitable setting. Avoid continuing merely to get the final word. After a decision, record the next action and any unresolved condition. You do not need to pretend the disagreement vanished, but people should be able to tell what happens next without interpreting the mood of the conversation as an instruction.
