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The personality disorders are said to be at the vanguard in the shift to a dimensional model of classification, as exemplified in the Alternative Model of Personality (AMPD) presented in Section III of the fifth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) for emerging models and in the 11th edition of the International Classification of Diseases (ICD-11). Considered herein are some limitations and challenges. For the DSM-5 AMPD trait model, these include problematic placements, inadequate coverage, perceived complexity, and lack of cutoff points. For the DSM-5 AMPD Level of Personality Functioning (LPF), they include the complexity, the questionable presumption that the LPF defines the core of personality disorder, the presumption that the LPF identifies what is unique to the personality disorders, and the premise that the LPF is distinct from the maladaptive traits. Limitations and challenges of the ICD-11 model are the absence of lower-order facet scales and the fact that only the level of severity is required. This review suggests that the trait of depressivity belongs with negative affectivity and suspicion belongs within antagonism, that maladaptive traits from all 10 poles of the five domains should be provided, and that cutoff points based on social-occupational impairment and/or distress should be provided. The review summarizes research that questions whether the LPF represents the core of personality disorder, identifies what is unique to the personality disorders, and is distinct from maladaptive traits. Finally, the review suggests that the ICD-11 should require the assessment of the traits and include facet scales.
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