Ever since Gene Glass popularized the effect size in the 1970s, readers of research have wanted to know how large an effect size has to be in order to...
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John Hattie has once again provided the education field an important way of thinking about building a profession grounded in evidence. And I was happy to see that he identified the power of school leaders as a key lever of school improvement.
I recently received an e-mail from a reader who raised a question that haunts a lot of teachers and parents: Does testing harm kids?
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