I thought this would be a paean to the joys of cognitive science in education, but surprisingly this short article (based on a longer research paper) not only describes some of the principles they authors applied but also the difficulties they faced while applying them. For example, they discuss the concern that the 'coherence principle', which "recommends avoiding redundant visuals or information", stands in the way of clarity, "where improving clarity meant making explanations longer, presenting ideas in more than one way."
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