Did the Hawthorne Plant Prove That Being Watched Makes People Work Harder?
Reanalyses of the Hawthorne factory data found little of the famous effect. A three-part split of what 'being watched' means, and which part matters.
In this article14 sections
The Hawthorne Works was a Western Electric plant in Cicero, Illinois, and the experiments run there between 1924 and the early 1930s are one of the most repeated stories in management courses. The lesson students take away is that workers produce more when they know someone is watching. The reanalyses that followed say the original numbers do not clearly show that, and the three things “watching” can mean separate cleanly when you look at which one the data supports.
What is the version everyone knows?
The textbook account has two parts. First, the illumination experiments, begun in 1924 under the National Research Council: engineers raised the lighting for a group of workers and output rose. They lowered it, and output rose again, in some tellings until the room was as dim as moonlight. Second, the relay assembly test room, started in April 1927: six women assembling telephone relays were given rest pauses, shorter hours and refreshments, and their output climbed. When the extras were removed, output stayed high.
Harvard’s Elton Mayo and his group joined in 1928, and the interpretation they shaped was about attention and belonging. The workers felt noticed. Henry Landsberger popularized the name in Hawthorne Revisited (1958), and by then it was folklore. Self-improvement writing repeats it as settled: observation lifts performance.
What do the original numbers say?
Four reanalyses, each by different researchers using different methods, are worth knowing by name. In 1974, H. M. Parsons (Science) argued that the relay-room women had been given feedback on their output and a pay scheme tied to a small group’s production, and that those two things, rather than the sense of being watched, drove the gains. Four years later Franke and Kaul (1978, American Sociological Review) ran a statistical reinterpretation and pointed to management discipline, the rest pauses and the economic anxiety of the early Depression, which gave workers a reason to look productive. By most accounts two of the six women in the relay room were also replaced early in the run, so the group was not the same group throughout.
Stephen R. G. Jones (1992, American Journal of Sociology) tested for a Hawthorne effect in the original relay assembly test room data and found slender or no evidence of one once the new pay scheme and ordinary learning were accounted for.
The most recent look is Levitt and List (2011, American Economic Journal: Applied Economics), who went back to the illumination experiments. Those records had long been presumed lost, and they found and analyzed a set. By their account the lighting changes had no consistent relationship to output, and what looked like a Hawthorne effect was, at most, slight: output tended to be higher while experimental changes were under way than when none were, and responded more to the experimenters’ changes in light than to natural ones. They did not rule out an observation effect; their verdict was that the textbook claim is much stronger than the data. The direction of the finding is the same across all four papers.
Was there a Hawthorne experiment where being observed did not help?
In the bank wiring observation room (1931 to 1932), researchers watched a group of men who wired and soldered switchboard equipment. Roethlisberger and Dickson, in Management and the Worker (1939), reported that the men held their output to a level the group had agreed on, and that fast workers were pressured to slow down. A researcher sat in the room and the men were fully aware of it. Output did not climb. It is the Hawthorne experiment that rarely makes the textbook.
That result fits the three-way split better than the famous ones do. Observation by outsiders brought attention, and the group’s own norm was the consequence that mattered more. The people able to punish a fast worker were his coworkers, and the researcher in the corner had no such power. For anyone choosing an accountability partner, that is a useful reminder that the person who can impose a cost is not always the person who is looking.
Does being watched ever change behavior?
The answer from newer work is sometimes, and not reliably. McCambridge, Witton and Elbourne (2014, Journal of Clinical Epidemiology) reviewed 19 studies of what they called research-participation effects. Some found changes in behavior when people knew they were being studied, some found none, and the authors argued that the label “Hawthorne effect” had hidden how different the situations were.
The laboratory cousin is the “watching eyes” finding, where a picture of eyes beside an honesty box raised payments in a Newcastle coffee room (Bateson, Nettle and Roberts, 2006). Northover et al. (2017, Evolution and Human Behavior) combined later experiments in two meta-analyses and found little evidence that artificial cues of being watched make people more generous. The clean version, where a gaze raises performance on its own, has trouble holding up.
What are the three things “watched” can mean?
When people say someone’s watching, they are bundling three separate ingredients. The Hawthorne papers are easier to read once you pull them apart.
| Meaning | What it is | Evidence it moves behavior |
|---|---|---|
| Attention | Someone knows what you are doing | Weak and inconsistent (Levitt and List; Northover et al.) |
| Feedback | Someone tells you how you did | Plausible and supported by Parsons’s reading of the relay room |
| Consequence | Something happens if you miss | Strongest of the three, but not shown by the Hawthorne data, which had no clean test of it |
What I would defend is the ordering. A gaze with nothing attached is the least reliable of the three, and the two other ingredients are the ones that account for the better-documented results in the factory data.
Why did the story last so long?
The first two reasons have little to do with evidence. The tale is pleasing: a company tries to help workers, and caring turns out to be more productive than any lever. It also suited a management profession that wanted a human-relations story to set against the stopwatch efficiency of Taylorism. And it was hard to check, because the raw records were scattered and, in the lighting case, thought lost, so each retelling quoted the previous retelling.
Elton Mayo’s The Human Problems of an Industrial Civilization (1933) carried the human-relations reading to a general audience, long before the reanalyses; by the time Parsons wrote in 1974, the story had been in textbooks for four decades. That last point, the unchecked claim, is the one that applies outside factories. A claim that cannot easily be checked gets repeated in the form that is most useful to the person repeating it. Observation helps you, therefore get an observer, therefore buy the observer. It may well be a good purchase, but the argument for it does not rest on Hawthorne. Another figure in this field that circulates without a source has its own debunking.
What did the researchers at the plant conclude at the time?
Less than the legend. Between 1928 and 1930 the company ran an interviewing program, with more than 20,000 employees asked about their work and supervisors, and the researchers came away emphasizing informal groups and the sense of being listened to. The relay-room women were treated as a social group more than as a pay-and-feedback problem. That framing is what Parsons, Franke and Kaul and Jones later pulled apart: it took attention as the explanation because the researchers were not looking at the pay scheme, the replaced workers or the Depression.
The lesson from the reanalyses is a methodological one. When a change comes bundled with a dozen other changes, the effect gets credited to whichever ingredient the observer finds most interesting. A habit app, a gym buddy and a deposit contract all arrive bundled in this way — attention, feedback and a forfeit sold as one product — which makes it hard for a buyer, or a researcher, to say which part did the work. Plant managers in 1927 had the same difficulty with a room full of changes.
Which study tested which ingredient?
None of the work above isolates all three for a personal habit. Levitt and List and Northover et al. speak to attention, Parsons’s reading of the relay room to feedback, and commitment-contract studies such as Giné, Karlan and Zinman to consequence, each with different people in a different setting. People who sell accountability tend to bundle all three and cite the best result for whichever one they are describing.
What changes if you pick someone to hold you accountable?
It changes which question you ask. Commitment-contract studies, which put a real forfeit on a miss, are where the evidence for the third ingredient lives, and six field experiments on precommitment are a good place to see them. “Will they see it?” is the attention question, and the research above says that on its own it is thin. The two questions that matter more are what they will tell you afterward and what happens when you do not do it.
A friend who can open a shared log but never comments has attention only. A friend who sees a short video, responds, and notices a missing one the next day has attention plus feedback. If a missed day also costs something you care about, a third ingredient is on. DontSnooze is built around that last arrangement, with friends who see the video and a photo penalty on a miss, but the framework applies to a notebook and a gym buddy as much as to an app.
Which of the three does your current setup actually have?
What readers ask about the Hawthorne effect
Who coined the term Hawthorne effect?
The earliest known use is by John R. P. French in 1953, and Henry Landsberger popularized it in his 1958 book Hawthorne Revisited. The studies it refers to ran at Western Electric’s Hawthorne Works in Cicero, Illinois, starting with lighting experiments in 1924.
What did Levitt and List find in the lighting data?
Levitt and List (2011, American Economic Journal: Applied Economics) analyzed illumination records that had been presumed lost. They found no consistent link between lighting changes and output, and only slight evidence that output ran higher while experimental changes were under way.
Did observation raise output in the bank wiring room?
No. In the bank wiring observation room, which ran from November 1931 to May 1932 with 14 men, Roethlisberger and Dickson (1939) reported that the group held output to a level it had set and pressured fast workers to slow down, with a researcher present throughout.
Is there good evidence that a forfeit on a miss changes behavior?
Better than for attention alone. Giné, Karlan and Zinman (2010, American Economic Journal: Applied Economics) found that smokers who accepted a commitment contract, money forfeited if they failed a nicotine test, were more likely to have quit, and the effect was still present at a 12-month check.