Retrieved January 25, 2017, from http://www.mtexpress.com/news/education/class-gives-students-the-grit-to-succeed/article_a79ad346-2203-11e6-a7c9-6b6d207220c4.html

John Hattie developed a way of ranking various influences in different meta-analyses related to learning and achievement according to their effect sizes. In his ground-breaking study “Visible Learning” he ranked 138 influences that are related to learning outcomes from very positive effects to very negative effects.

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