The result is a book that provides the best and most comprehensive information about recent scientific developments and a splendid practical guide for how they are being implemented and what we are learning in the process. The issues are presented in all of their complexity but translated into language that is clear, direct, and easy to follow. The format also lends itself to understanding the complex issues and their implications through excellent charts, question and answer sections, and chapters that vary from describing diagnostic issues to stating very specifically how to expand and evaluate the services one is receiving. The comprehensive references and lists of additional resources also add greatly to the overall package.