An effect observed after the Hawthorne experiments where the respondents behaved differently merely by the virtue of being observed. The workers in the Hawthorne factory showed an increase in productivity through all experiments because they were being observed in an experiment.
Diagrams

Originated from/Coined by
Henry A Landsberger
Further Reading/ References
https://en.wikipedia.org/wiki/Hawthorne_effect
https://www.verywellmind.com/what-is-the-hawthorne-effect-2795234
https://www.geckoboard.com/learn/data-literacy/statistical-fallacies/hawthorne-effect/
