Although groups brainstorm less effectively than individuals, they perform better on certain judgment tasks, perhaps because members learn from each other.
Asked to estimate the flight distance between European cities, groups of students averaged 30% fewer errors than individuals, according to a team led by Thomas Schultze of Georg-August-University in Goettingen, Germany. Accuracy can be further increased if members are told which member is most competent, the researchers say.
[Source: HBR]
