Mistaken Assumption
also Wrong Assumption · False Premise
The hidden false premise behind an apparent conflict, whose discovery dissolves the conflict and shows it was never a real tradeoff.
A mistaken assumption is the faulty premise lurking behind an apparent conflict. Goldratt’s reasoning, adopted by CF, is that a genuine conflict cannot arise from a single coherent starting point: if two sides share a common purpose yet seem to clash, there must be a logical error somewhere in how one side’s demand was derived from that shared goal. The conflict is therefore not inherent in reality but an artifact of a wrong belief. Find and fix that belief, and the conflict “evaporates” rather than requiring a settlement.
This is the engine of the Evaporating Cloud. You diagram both sides of a conflict, connect each to the shared underlying value or goal, then scan the logical links for the one assumption that need not hold. Refuting it opens an alternative that satisfies everyone, yielding a win-win solution instead of a compromise.
The stakes are why CF insists on this. It rests on no conflicts of interest: apparent conflicts trace to incorrect assumptions, never to reality itself, just as two clashing measurements of a building mean one is wrong, not that the truth is their average. CF adds that conflicts must be resolved decisively, by locating the wrong assumption, rather than by compromise. Compromising makes disagreement dangerous, because every objection erodes a good idea. Hunting the mistaken assumption inverts this: an objection becomes a clue pointing at the false premise, so “yes, but” is welcome help toward a better solution.