[Editor’s note: This story, originally published on July 24th of this year, was our #3 most popular story of the year. Happy holidays, and thank you for tuning into our 2017 countdown!] In 2015, ...
Conceptual change programs, self-reported grades and collective teacher efficacy all have effect sizes greater than 1.15. To put that into perspective, if you compared collective teacher efficacy at 1 ...
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