This is the best book on the topic that I have read, and I've read many. Clear, very thorough, and practical. The therapist's guide provides the most detailed and yet easy to read explanations of such topics as hyperventilation, hypoglycemia, the adrenalin response and many other topics and how they contribute to anxiety and panic; and equally important, how to correct their effects. For therapists like me, the therapist's guide provides an excellent roadmap to helping patients. This companion worksbook designed for patients provides easy to use forms that can be copied from the book or from a download site on the web they can be printed. I highly recommend this book and Barlow's other books, both the therapist's guide and the workbook for patients. While many patients may be able to use the workbook alone to overcome their condition, more complicated situations, or for people who need the extra structure of counseling sessions; either way the workbook is a valuable resource.