The transformation from medical student to physician is a gradual one, requiring the assimilation of vast amounts of knowledge as well as the development of the ability to “think like a doctor.” The thought processes that enable a physician to “think like a doctor” are perhaps the most difficult skills the clinician-in-training must acquire in medical school and residency. In this extraordinary book, Dr. Howard Barrows, one of the world’s foremost medical educators, beautifully and simply articulates those mental processes that allow accomplished physicians to reach diagnostic conclusions with speed and confidence. Students who master the contents of this book will take a long step forward in acquiring the diagnostic skills that are the hallmark of the experienced physician.