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Small classes. High standards. More money. These popular remedies for school ills aren't as effective as they're sometimes thought to be. That's the somewhat controversial conclusion of education researcher John Hattie.
Over his career, Hattie has scrutinized more than 1,000 "meta-analyses," looking at all types of interventions to improve learning. The studies he's examined cover a combined 250 million students around the world.
