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ERIC Number: ED106309
Record Type: RIE
Publication Date: 1975-Apr-2
Pages: 32
Abstractor: N/A
The John Henry Effect: Potential Confounder of Experimental vs. Control Group Approaches to the Evaluation of Educational Innovations.
Saretsky, Gary
The paper describes an unacknowledged artifact that may confound experimental evaluations of innovations. The paper hypothesizes that control group members (teachers, pupils, etc.) perceiving the consequences of an innovation as threatening to their job, salary, status, or traditional patterns of working, may perform atypically and confound the evaluation outcomes. Demand characteristics within the social psychology of the experiment provide the theoretical framework. The paper compares similarities and differences among the John Henry Effect and other research-biasing factors. Four evaluation studies in which the John Henry Effect was manifested are described. Alternative evaluation designs for the artifact's control are discussed. (Author)
Publication Type: Reports - Research
Education Level: N/A
Audience: N/A
Language: N/A
Sponsor: N/A
Authoring Institution: N/A
Note: Paper presented at the Annual Meeting of the American Educational Research Association (Washington, D.C., March 30-April 3, 1975)