Abstract
The DSM‐5 Alternative Model for Personality Disorders introduced a dimensional perspective on personality disorders and their assessment by measuring personality functioning in the following domains: Identity, Self‐Direction, Empathy, and Intimacy. This study provides a replication of the psychometric evaluation of the Semi‐Structured Interview for Personality Functioning DSM‐5 (STiP‐5.1) within a mixed clinical sample and a community sample. The sample consisted of 188 adults: 86 participants from the general population and 102 people from a mixed clinical sample. All participants completed the STiP‐5.1 and Level of Personality Functioning Scale–Brief Form (LPFS‐BF 2.0). Results showed good internal consistency (McDonald’s ω = 0.89–0.94) and promising convergent validity (correlations with LPFS‐BF 2.0 above 0.6) of the STiP‐5.1. Its scores differentiated participants within the community sample from those in the mixed clinical sample with large effect sizes (r
rb = 0.77–0.88). Moreover, the impairment in personality functioning was more pronounced in people with personality disorders than in other psychiatric disorders (medium effect size, r
rb = 0.46–0.57), supporting the notion of a continuum of personality functioning impairment. The STiP‐5.1 therefore offers an instrument with satisfactory psychometric properties for the assessment of personality functioning both for research and clinical practice.