I read the book Quiet by Susan Cain. Brainstorming was likened to as the 'New Group Think' in that book. The three reasons stated for the inefficiency of brain

I read the book Quiet by Susan Cain. Brainstorming was likened to as the 'New Group Think' in that book. The three reasons stated for the inefficiency of brainstorming are: (1) Production blocking (Only one person can talk at a time while others listen. Think of a single entry queue.) (2) Evaluation apprehension (Some (or most) people hesitate in presenting their idea because it might be critiqued or ridiculed.) (3) Social Loafing (There are times when members of a group will slack-off because they know other members will take over the work.)