This book reports the results of an evidence-based case study for mental disorders which show that PTC has been very successful in bringing about deep and constant therapeutic changes. In response to the need of a more efficient approach for the treatment of psychological disorders, especially the broad spectrum of anxiety disorders, the PTC psychotherapeutic model was developed. Results of the follow-up studies reported in the present book show that the relapse rate in this model is in its lowest level compared to other psychotherapeutic approaches. Simple nature of the PTC protocol, described within the present book, allows psychotherapists and clinical practitioners to use this newly developed psychotherapy model for the treatment of mental disorders. This newly developed psychotherapy model can be applied to new developments in the field of psychotherapy theory, research, and practice. All psychotherapy associations, psychotherapy societies, psychological associations, psychotherapy societies, healthcare organizations, and academic libraries are likely to be part of the readership of this book.