The last ten years have witnessed considerable academic interest in the construct of worry, and it is likely to be a central diagnostic feature of a number of anxiety disorders with the advent of DSM-IV. This text represents an up-to-date review of research methods. Worrying can now be legitimately considered as one of the most important features of anxiety. In this book, the experience and function of worry is described in considerable detail, and attempts are made to explain its aetiology and maintenance from a broad range of theoretical perspectives.