The Board Review Series (BRS) is aimed at providing basic knowledge as it relates to clinical situations and is used primarily by medical students studying for the United States Medical Licensing Examinations (USMLE).  BRS BEHAVIORAL SCIENCE covers material on this subject that is addressed on USMLE Step 1.  Previous editions of this volume have been quite popular with medical students. As in its previous editions, BRS BEHAVIORAL SCIENCE is written in outline format to provide an efficient method of studying Behavioral Science for USMLE. A major focus of books in the BRS series is to provide experience to students in answering USMLE-style questions. To this end, the book contains over 700 such questions with accompanying annotated answers. An exam follows each chapter and a Comprehensive Exam is included at the end of the book.