When former President Bush issued the final approval to invade Iraq, he asked whether anyone had any last thoughts or recommendations. When no one commented, the order was given. The authors give this as an example of how ? groups can make good decision when there is a strong leadership. cohesive groups tend to disagree more frequently than groups of diverse experts. groups do not always make good decisions when they are cohesive and want to please their leader. groups make the best decisions when they are cohesive and want to please their leader