Theories of expertise have profoundly shaped modern medical education. Most notably, theories of the stages of skill acquisition to become an expert, developed by Dreyfus and Dreyfus, were used to inform the Accreditation Council for Graduate Medical Education's six core competencies. Becoming an expert takes time, and Ericsson has argued that, across a variety of activities, it takes 10 000 hours of deliberate practice to achieve expertise.
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