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Changes in instructional time, says this study summarized in the ASCD Research Brief (5/10/05), do not generally increase or decrease student achievement, unless the changes are dramatic. Curriculum and instructional quality appear to have a much greater effect on achievement than do total hours of instructional time. The researchers' goal was to examine the time various countries allocated to the school year across four subject areas -- math, science, civics, and language -- to see if a relationship existed between time spent in school and student achievement. The researchers looked at three international assessments conducted between 1999 and 2000.

Laitsch, D. (2005). Instructional time and student achievement. Research brief (Vol. 3 No. 10, May 10 2005). Retrieved from ASCD 21 Apr 2008. Link: http://www.ascd.org/portal/site/ascd/template.MAXIMIZE/menuitem.03e1753c...

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