This book has been designed to help you improve your performance on the Certified Emergency Nurse (CEN) exam as well as help you to identify some weak areas in your nursing knowledge. The format of the book is different than most of the common board preparation review books in that you are not asked to select the best answer. Instead the answer is provided for you. We have found that this method of board exam review will give you the basic concepts necessary for passing the CEN exam. Now a few words about the exam and its format, the intent of this book, and how this book is best utilised.