The clinical evaluation of obsessionality: a development of the Leyton Obsessional Inventory.

The Leyton Obessional Inventory gives both an indication of the range of obsessional symptoms present and the degree of resistance and interference associated with each symptom. A new method is described in which the covariation of resistance and interference is represented in the form of a matrix. The results, using this method, can give a unique picture of the quality of the patient's symptoms from the clinical standpoint and provide useful guidelines for treatment and follow up. Automatic data-provessing is offered for the convenience of clinicians and researchers wishing to utilize the test in this form.