Susan Cain

Psychologists usually offer three explanations for the failure of group brainstorming. The first is social loafing: in a group some individuals tend to sit back and let others do the work. The second is production blocking: only person can talk or produce an idea at once while the other group members are forced to sit passively. And the third is evaluation apprehehsion: meaning the fear of looking stupid in front of one’s peers.”