This book is a guide for the medical student or recently graduate MD preparing to take the third part (Step 3) of the United States Medical Licensing Exam. As anyone wishing to practice medicine in the United States must take and pass this examination, the potential market is a very large one, with 16,000 new medical school graduates eligible for the exam every year. There are a considerable number of books for the Step 1 Exam (basic sciences) and the Step 2 Exam (clinical medicine) but very few for the Step 3 Exam. It had been common to study for Step 3 using Step 2 materials since both cover clinical medicine, but in recent years the Step 3 exam has separated itself from Step 2, focusing on clinical management of specific medical conditions in a case-scenario fashion. As a result, the few available Step 3 books have become very successful, largely by default. Kevin Schwechten, who has recently taken the Step 3 exam himself and has evaluated the other competing books, has come up with an approach focusing heavily on those questions most commonly asked on the exam, and he follows an outline that is provided by the National Board of Medical Examiners, which is the group that writes the exam. As those taking the exam have just recently graduated from medical school and have been thrown into a very hectic schedule on the hospital wards, with long housr, little sleep, and little time for studying, an effective book for Step 3 must be concise and to the point. Therefore, this book is written not to cover all of clinical management, but to focus on those areas that most ofen appear on the exam. This will be the first book in our effort to produce more books for students preparing for their licensing exams.