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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.

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Peer reviewed Peer reviewed
ERIC Number: EJ640542
Record Type: CIJE
Publication Date: 2001
Pages: N/A
Abstractor: N/A
Reference Count: 0
ISBN: N/A
ISSN: ISSN-0022-0663
Diffusion Effects: Control Group Contamination Threats to the Validity of Teacher-Administered Interventions.
Craven, Rhonda G.; Marsh, Herbert W.; Debus, Raymond L.; Jayasinghe, Upali
Journal of Educational Psychology, v93 n3 p639-45 Sep 2001
Within-class experimental designs are subject to diffusion effects whereby both experimental and control students benefit from the intervention, thereby contaminating the control group and biasing evaluations of intervention effects. In support of diffusion effects, this study showed that a classroom intervention resulted in higher academic self-concepts for internal controls compared with external controls. (Author)
Descriptors: Aptitude Treatment Interaction, Class Activities, Classroom Environment, Classroom Techniques, Control Groups, Diffusion (Communication), Intervention, Learning Processes, Theory Practice Relationship, Validity
Publication Type: Journal Articles
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers: N/A