Bloom's two-sigma problem: one-on-one tutoring outperforms classrooms by two standard deviations and nobody knows how to scale it

Popularity Index: 13 Updated at 2026-10-10 01:27 UTC

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The learning styles myth: teaching to visual vs auditory learners feels right and replicates zero times — yet it still shapes lesson plans Behaviorism shaped a century of classrooms but its grip loosened once cognition came back into the lab Cognitive load theory explains why less is more in lesson design — working memory is the bottleneck Lectures survived 900 years not because they work but because they scale — active learning now has the data and the lecture has the tradition The spacing effect is one of the most replicated findings in psychology and almost no curriculum is designed around it Social learning theory says we learn most from watching others fail rather than from being told not to fail Adult learning theory insists adults learn differently — the evidence is thinner than the confidence Dewey's learning by doing and Skinner's programmed instruction are opposite answers to the same question: what actually changes behavior Transfer of learning is the graveyard of good teaching — skills learned in one context rarely move to another without help Zone of proximal development — Vygotsky's idea that the best teaching works just beyond what you can do alone

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