NotesFAQContact Us
Collection
Advanced
Search Tips
50 Years of ERIC
50 Years of ERIC
The Education Resources Information Center (ERIC) is celebrating its 50th Birthday! First opened on May 15th, 1964 ERIC continues the long tradition of ongoing innovation and enhancement.

Learn more about the history of ERIC here. PDF icon

ERIC Number: ED106309
Record Type: RIE
Publication Date: 1975-Apr-2
Pages: 32
Abstractor: N/A
Reference Count: 0
ISBN: N/A
ISSN: 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
Identifiers: N/A
Note: Paper presented at the Annual Meeting of the Ameri