Development and validation of the Schedule of Compulsions, Obsessions, and Pathological Impulses (SCOPI)

Abstract

This article describes a factor analytically derived, self-report instrument - the Schedule of Compulsions, Obsessions, and Pathological Impulses (SCOPI) - using data from college students, adults, psychiatric outpatients, and patients with obsessive-compulsive disorder (OCD). The five SCOPI scales all are internally consistent (with coefficient alphas of. 80 and higher) and are strongly stable across a 2-month interval (with retest correlations ranging from.79 to.82). They also show good convergent and adequate discriminant validity (a) when correlated with other OCD measures and (b) in analyses of self-ratings versus spouse ratings. Additional analyses indicate that three scales - Obsessive Checking, Obsessive Cleanliness, and Compulsive Rituals - assess core symptoms of OCD. The two remaining scales - Hoarding and Pathological Impulses - appear to tap different (but related) constructs. © 2005 Sage Publications.