A review of 39 studies indicates that achievement-test scores decline over summer vacation. Meta-analysis results from combining the 13 most recent studies indicate that the summer loss equals about one month on a grade-level equivalent scale. Discusses implications for school calendar changes. Contains 68 references. (SLD)
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Research supported by the Center for Research in Social Behavior, University of Missouri-Columbia and the Center for Excellence for Research and Policy on Basic Skills, University of Tennessee.