Group members will attempt to find problems in group solutions by evaluating them individually. But making each member of the group analyze solutions individually is problematic. Group members can spend too much time debating when there is an important deadline. Feelings can be hurt when the ideas of individual group members are criticized. Group members will not attempt to conform with beliefs of the leadership if they are unsure of what the leader wants.
Problems arise because the leader often feels that there is no centralized control within the group.
Every group would come up with different ideas, and the pressure to conform is not as great. In some instances security can be a problem. Information is more likely to leak out if more people are aware of the information. Problems also arise when a group assumes that another group will examine the pieces to the solution that have been missed. When only one group is working on a particular problem this doesn't happen.