시카고 외곽지역의 Western Electric Company, the Hawthorne Plant 연구 (1924-1932), PI: Elton Mayo
Four main research phases:

1. The illumination experiments
   • the Hawthorne Effects
2. The Relay Assembly Test Room Study
3. The Interviewing Programme
4. The Bank Wiring Observation room Study
   • The power of (informal) group
   • The workers were more responsive to the social norms of peer group than to the controls or incentives of management.
   • See an article at Analytictech
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