Psychometric and circumplex properties of the octant scale Impact Message Inventory (IMI-C): A structural evaluation

The Impact Message Inventory (IMI) is a unique clinical and research instru ment that describes an individual's interpersonal behaviors through the int ernal reactions and perceptions evoked in others. The present article descr ibes an extensive analysis of a revised g-scale, circumplex version of the IMI (the IMI-C) across a combined sample (N = 1,109) from 8 studies. Overal l, the IMI-C demonstrates adequate psychometric and structural properties; principal-components and multidimensional scaling analyses suggest that the scales generally conform satisfactorily to a circular ordering, and conser vative confirmatory factor analyses suggest some departure of the IMI-C sca les from true circumplexity. It is argued that the IMI-C represents a subst antial development for researchers who wish to study interpersonal impacts in counseling and psychotherapy research.