Hawthorne effect

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Related to Hawthorn effect: placebo effect, Hawthorne studies

Hawthorne effect

(ˈhɔːˌθɔːn)
n
(Sociology) improvement in the performance of employees, students, etc, brought about by making changes in working methods, resulting from research into means of improving performance. Compare iatrogenic, placebo effect
[from the Western Electric Company's Hawthorne works in Chicago, USA, where it was discovered during experiments in the 1920s]