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Introduction xvii earlier editions of this book as well as for writing up his thoughts and reflections in the foreword of this one. We also offer thanks to Dr. Lester Tobias for providing case material for an earlier edition of the book, as well as to Dr. Jennifer Abel and Dr. Amy Wenzel for providing additional case material for this one. Their rich case descriptions bring PRT procedures to life and illustrate the many ways that the standard procedures can be applied to a variety of clinical situations. Finally, we wish to thank several expert colleagues who contributed updated reviews of relevant research for two of the chapters included in this edition. Drs. Alisa Huskey, Deanna Swain, and Bruce Friedman pro- vided an excellent review of research on the direct impact of PRT on phys- iology. Their chapter, “The Physiology of Relaxation,” will serve as an important resource to clinicians who wish to better understand how PRT works—for their own information and for the benefit of their clients. We also thank Dr. Evelyn Behar and her graduate students Kara Buda and David Yap for their updated chapter on “Evaluative Research on Progres- sive Relaxation Training,” which reviews the clinical effects of PRT and AR in the treatment of various anxiety and related disorders.