A reasoning flaw that infers a property of the whole from a property of its parts — assuming that what is true of each member of a group must be true of the group as a whole. Classic LSAT example: "Every player on the basketball team is outstanding individually; therefore, the team will outperform every other team." The fallacy ignores that collective performance depends on interactions (chemistry, coaching, system fit, teamwork) that do not reduce to individual qualities — five elite players who cannot cooperate may lose to five good players who work together seamlessly.