The Hawthorne Effect: Does Being Watched Change Behavior?

The Hawthorne effect is the idea that people change their behavior when they know they’re being observed. It’s widely cited in management, research methods and self-improvement. But the story behind it is more complicated than the popular version.

This guide explains where the term comes from, what later research found, and how the underlying idea (that observation and attention can change behavior) applies to habits. It’s part of our accountability partner guides.

Where the term comes from

The name comes from studies at the Western Electric Hawthorne Works factory near Chicago in the 1920s and 1930s. Researchers changed conditions like lighting and break schedules to see how productivity changed. Productivity seemed to rise with many changes, even when lighting was reduced, which some interpreted as workers responding to the attention of being studied.

What later research found

Later reviews of the original data have questioned the classic story. Re-analyses found the original evidence weaker and more mixed than the textbook version, with other explanations possible (such as seasonal patterns, feedback and changes in workers).

Today, researchers often use “Hawthorne effect” more broadly for any change in behavior caused by being observed or studied, and they treat its size as uncertain and dependent on context.

Related, better-supported ideas

Several related effects have more consistent support:

• Social facilitation: the presence of others tends to improve performance on simple, well-practiced tasks, and can hinder complex, unfamiliar ones.
• Self-monitoring: tracking your own behavior often makes you more aware of it and can help change it. See our habit tracker guide.
• Accountability: expecting to explain your actions to someone tends to make people more careful and consistent. See the psychology of accountability.

How to use observation for your habits

You don’t need surveillance. Gentle, chosen observation works better:

1. Track yourself

A simple tracker makes your own behavior visible. See bullet journal habit tracker layouts.

2. Do habits where others can see you working

A library, a gym, a coworking space or a shared online session. Others don’t need to watch you; knowing they’re there helps many people start and stay on task. See virtual body doubling.

3. Report to someone

A weekly message to a friend about what you did. See should you tell people your goals for how to share in a way that helps.

4. Keep it supportive

Observation that feels like judgment or surveillance can backfire, causing stress or avoidance. Choose people and settings that feel supportive.

Disclosure: Cohorty publishes this journal. Cohorty uses light, chosen observation: you book a 30-minute session, and others who booked the same time see your one-line plan and whether you’ve tapped Done, with no camera or chat. See how Cohorty sessions work.

Common questions

What is the Hawthorne effect?

The idea that people change their behavior when they know they’re being observed, named after 1920s–30s studies at the Hawthorne Works factory.

Is the Hawthorne effect real?

The original studies have been questioned, and the effect’s size is uncertain. But being observed, tracked or held accountable can change behavior in many situations.

What is an example of the Hawthorne effect?

People working harder or following rules more carefully when they know someone is watching or studying them.

How can I use the Hawthorne effect for habits?

Track your habits, do them in places where others are working too, and report progress to someone supportive.