John Henry Effect

History

The John Henry effect is named after legendary American folk hero John Henry, a steel driver in the 1870s, who, when faced with replacement by the steam drill, worked so hard to outperform the machine that he died in the process. In this scenario, John Henry represents the status quo (or control condition) that is threatened to be overturned by the innovation of the steam drill (or experimental condition), prompting him to work harder than he otherwise would have and producing atypical results.

Research Implications

The term John Henry effect was coined by Robert Heinich in 1970 in response to the failure of innovative education techniques to produce significantly better results than traditional classroom teaching. In examining the results, Heinich suggested that the classroom teachers performed well above average when they were aware that their work was being compared to alternative education methods. This prompted further inquiry by Gary Saretsky who noted the John Henry effect as a confounding influence on experimental evaluation of innovation.

Saretsky observed this effect in a 1972 analysis of the Office of Economic Opportunity’s experiment in performance contracting. The classroom teachers instructing the control group actively worked to outperform the “outsider” performance contractors who worked with the experimental group, leading to atypical performance from the control group students. This change invalidated results that may have been used to promote reform in educational practices and underlined the need to control for similar confounding factors in future experiments.

The John Henry effect has frequently been compared with the Hawthorne effect, also known as the observer effect. It refers to the phenomenon of actors modifying their behavior in response to the knowledge that they are being observed. Although related, the John Henry effect differs in that it focuses on consequences or perceived threat, whereas the Hawthorne effect focuses on the awareness and interaction between actor and observer. Additionally, the John Henry effect is typically associated with the control group and the Hawthorne effect with the experimental group.

See also Hawthorne Effect