DIRT for Checkers is a comprehensive treatment package that has been specifically designed to reduce expectancies of danger or threat in those with Obsessive Compulsive Disorder (OCD) with predominant checking concerns. All information presented is designed to reduce the expectation that harmful events such as the fear of fire, damage, theft, harm to others and other physical losses will follow any failure to check. The treatment includes attentional focusing, cognitive restructuring, double-checking experiments, corrective information, filmed interviews, probability of catastrophe task.