TY  - JOUR
AU  - Levitt,Steven D.
AU  - List,John A.
TI  - Was there Really a Hawthorne Effect at the Hawthorne Plant? An Analysis of the Original Illumination Experiments
JF  - National Bureau of Economic Research Working Paper Series
VL  - No. 15016
PY  - 2009
Y2  - May 2009
UR  - http://www.nber.org/papers/w15016
L1  - http://www.nber.org/papers/w15016.pdf
N1  - Author contact info:
Steven D. Levitt
Department of Economics
University of Chicago
1126 East 59th Street
Chicago, IL  60637
Tel: 773/834-1862
Fax: 773/702-8490
E-Mail: slevitt@midway.uchicago.edu

John List
Department of Economics
University of Chicago
1126 East 59th
Chicago, IL 60637
Tel: 301/405-1288
Fax: 301/314-9091
E-Mail: jlist@uchicago.edu
AB  - The "Hawthorne effect," a concept familiar to all students of social science, has had a profound influence both on the direction and design of research over the past 75 years. The Hawthorne effect is named after a landmark set of studies conducted at the Hawthorne plant in the 1920s. The first and most influential of these studies is known as the "Illumination Experiment." Both academics and popular writers commonly summarize the results as showing that every change in light, even those that made the room dimmer, had the effect of increasing productivity. The data from the illumination experiments, however, were never formally analyzed and were thought to have been destroyed. Our research has uncovered these data. We find that existing descriptions of supposedly remarkable data patterns prove to be entirely fictional. There are, however, hints of more subtle manifestations of a Hawthorne effect in the original data.
ER  -