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Adair, John G.	1
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Hawthorne Control Procedures in Educational Experiments: A Reconsideration of Their Use and Effectiveness.

Adair, John G.; And Others – 1987

A meta-analysis was conducted on 44 educational studies that used either a (labelled) Hawthorne control group, a manipulation of Hawthorne effects, or a group designed to control for the Hawthorne effect. The sample included published journal articles, ERIC documents or unpublished papers, and dissertations. The studies were coded on 20 variables,…

Descriptors: Control Groups, Educational Research, Effect Size, Experimental Groups

A Meta-Analysis of Suggestopedia, Suggestology, Suggestive-accelerative Learning and Teaching (SALT), and Super-learning.

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Moon, Charles E.; And Others – 1986

Forty studies using one or more components of Lozanov's method of suggestive-accelerative learning and teaching were identified from a search of all issues of the "Journal of Suggestive-Accelerative Learning and Teaching." Fourteen studies contained sufficient statistics to compute effect sizes. The studies were coded according to substantive and…

Descriptors: Cognitive Processes, Control Groups, Educational Research, Effect Size