Borderline Personality Organization Scale
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About Borderline Personality Organization Scale
The Borderline Personality Organization Scale (BPO; Oldham et al., 1985) is a 30-item, self-report measure used to assess experiences, behaviours, and beliefs common among individuals with borderline personality disorder (BPD). The BPO was derived through factor analysis of items designed by the authors and administered to psychiatric inpatients, outpatients, and normal controls.
TheBPO contains three subscales: (a) identity diffusion, a poorly integrated sense of self or others; (b) primitive defences, including splitting, idealization, devaluation, omnipotence, denial, projection, and projective identification; and (c) reality testing, reflecting the transient psychotic episodes common among individuals with BPD. The BPO has good internal consistency (Cronbach’s ® D :92, .87, and .84 for the identity diffusion, primitive defences, and reality testing subscales, respectively; Oldham et al., 1985).
In addition, the subscales are all highly correlated with one another (rs > .74; Oldham et al., 1985). Finally, the BPO has good construct validity, as scores on each of the BPO subscales are significantly correlated with scores on the C (Borderline) subscale of the Millon Clinical Multiaxial Inventory-II (rs D .79, .72, and .74 for the identity diffusion, primitive defenses, and reality testing subscales, respectively, ps < .01; Dutton, 1994).