Advancing our understanding of the cognitive underpinnings of psychopathology, this is the first volume dedicated exclusively to the role of UITs (unwanted intrusive thoughts) across a wide range of psychological disorders. This volume will inform the work of researchers and clinicians alike. In addition, the scope and scientific grounding of the book make it an excellent resource for students in graduate clinical training programs to use in their studies and throughout their careers. It will serve as a unique supplemental text in courses in psychotherapy, abnormal psychology and psychopathology, and cognitive-behavioral theory.