Constructive disagreement improves decisions by revealing assumptions, risks, and alternatives. Begin with the shared goal, then state the point of difference clearly. Explain the evidence or criterion behind your concern and offer an alternative, question, or test where possible.
Not every disagreement must end in consensus. The team may use an owner, vote, experiment, escalation path, or deadline to decide. Once a fair decision is made, confirm whether you can support it, what risk should be monitored, and what new evidence would justify revisiting it.