Why do experts miss the step a beginner needs?
Familiarity can hide prerequisites. Compare the techniques each speaker uses to expose the gap between what a presenter assumes and what a learner can reconstruct.
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What does explaining an answer to a peer reveal? →Collaborative learning gains a concrete mechanism when students have to explain their reasoning to one another. Agreement on an answer alone tells the teacher less.Can you reconstruct the area formula? →A formula is easier to transfer when a learner can rebuild the reasoning that produced it. Compare a memorized answer with a representation that makes the derivation visible.Does getting the answer mean understanding the concept? →Concept questions in physics and geometric intuition in linear algebra reveal gaps that procedural success can hide. Neither approach rules out calculation practice.
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they will hallucinate that there's material in your presentation that isn't thereyou're no longer aware of the conceptual difficulties of beginning learner