photo credit: dcJohn via photopin cc John Hattie, in his book Visible Learning, found through his synthesis of many research studies that class size has only a .21 effect size on learning.
Why I Take Class Size Research With a Grain…
photo credit: dcJohn via photopin cc John Hattie, in his book Visible Learning, found through his synthesis of many research studies that class size has only a .21 effect size on learning.