Abstract
This note reviewed the various variables available in the scholarly literature that have been demonstrated to show a relationship with K-12 student achievement within the categorization system of Hattie (2009). Subsequently, the Hattie framework was used as a heuristic example of applying the effect size Cohen’s d and also the Common Language Effect.

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Copyright (c) 2014 Hans E. Muehsler, David A. Walker, Thomas J. Smith (Author)
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