All generals believe in the existence of the battle they’re about to fight against one another.

They probably also agree on many facts concerning battle conditions: the terrain, the weather, the disposition of the forces, and where they disagree it has less to do with opinion than it does the availability of facts.

Beliefs diverge when they consider one another’s intentions, perceptions and character, and the psychological state of the men in their charge.

The generals must disagree on who ought to win the battle.

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Many types of agreement exist, and each requires different methods for resolution. Consider the differences between dis/agreements of perceptions, facts, insights and morals.