We thank Ella Cornell, M.D., Rose Hatala, M.D., Margaret Isaac, M.D., Jonathan Sherbino, M.D., M.Ed., and Robert Trowbridge, M.D., for their helpful feedback on earlier versions of the manuscript. Jeffrey M. Drazen, M.D., Raja-Elie Abdulnour, M.D., and Judith L. Bowen, M.D., Ph.D., are the editors of the Medical Education series.