This article reports on the development of a revised version of the Obsessive–Compulsive Inventory

theoretically driven, self-report measure. The revised OCI (OCI–R) improves on the parent version in 3 ways: It eliminates the redundant frequency scale, simplifies the scoring of the subscales, and reduces overlap across subscales. The reliability and validity of the OCI–R were examined in 215 patients with obsessive–compulsive disorder (OCD), 243 patients with other anxiety disorders, and 677 nonanxious individuals. The OCI–R, which contains 18 items and 6 subscales, has retained excellent psychometric properties. The OCI–R and its subscales differentiated well between individuals with and without OCD. Receiver operating characteristic (ROC) analyses demonstrated the usefulness of the OCI–R as a diagnostic tool for screening patients with OCD, utilizing empirically derived cutscores. The Obsessive–Compulsive Inventory (OCI) is a comprehen-sive self-report measure for assessing symptoms of obsessive– compulsive disorder (OCD). It contains 42 items rated on two 5-point Likert-type scales: one measuring the frequency of symp-toms and the other evaluating the distress caused by the symptoms (Foa, Kozak, Salkovskis, Coles, & Amir, 1998). The 42 items form seven subscales, which are based on symptom categories that ar