Fill a room with barbarians, say Bryn Zeckhauser and Aaron Sandoski in
How the Wise Decide (Crown Business), a culture of candor: "Participants accept and embrace the highly charged atmosphere of the room. Everyone is expected to come prepared and to have an opinion." Bosses, too, must be prepared for a critique: "Truth is the goal, and when the decision finally emerges, everyone is expected to sign on to support it."