Disagreeing in a forum thread without derailing it

Quote the specific claim you see differently, then explain the evidence or condition behind your view. State your own result without assuming the other person's motives or experience.

A useful disagreement may reveal that two people used different versions, regions, inputs, or definitions. Ask one clarifying question and be willing to update your conclusion if the context changes. Keep criticism directed at the idea, not the person.

Which claim needs a more precise qualification?