DIRT is a unique new evidence-based treatment program designed to specifically reduce expectancies of danger or threat in OCD washers. Unlike many traditional OCD treatments, DIRT is based on the rationale that the therapist should provide as much factual information as possible to decrease the expectancy of illness or disease and thus reduce the high dropout rate seen in conventional  OCD exposure and response prevention  programs. DIRT consists of six discrete treatment components aimed at reducing the number of intrusive thoughts experienced and concurrently allowing the client to successfully change the remaining thoughts and beliefs related to illness and contamination. The treatment includes attentional focussing, cognitive restructuring, corrective information, microbiological experiments, filmed interviews, and a probability of catastrophe task. The book includes a resource CD with patient handouts and a DVD of interviews.