Definition
The Hawthorne Effect (or Observer Effect) is the phenomenon where individuals modify their behavior in response to their awareness of being observed. In research, it represents a systematic experimenter artifact that can lead to false conclusions about the efficacy of an intervention.
Why It Matters
It reveals how the simple act of being observed can change human behavior, potentially skewing the results of scientific studies and management initiatives. Accounting for this effect is vital for anyone designing experiments or attempting to improve organizational productivity.
Core Concepts
- Nonspecific Improvement: The original studies (1924–1933) showed that workers’ productivity improved regardless of whether light levels were increased or decreased, suggesting the attention itself was the cause.
- General Experimenter Artifact: Beyond simple observation, the effect includes the “clinical trial effect”—participants in a study take better care of themselves and follow protocols more strictly because they are part of a project.
- Clever Hans Link: A special case where the observer unwittingly communicates desired answers or behaviors to the subject through non-verbal cues.
- Teacher Expectation Effect: The related phenomenon where the expectations of an authority figure (e.g., a teacher or a researcher) can measurably influence the performance of the subjects.