from Part I - Historical Perspectives
Published online by Cambridge University Press: 25 June 2025
Development of the dimensional models of personality disorders in DSM-5 and ICD-11 is a milestone for trait-theoretic research on personality. For a trait concept, such as “cautious,” “humorous,” to characterize a person’s personality, their behavior must be consistent regarding that concept. Since the 1960s, however, Walter Mischel insisted that human behavior lacks cross-situational consistency, and that it emerges instead from the interplay between personal factors and situational contexts. According to this “interactionism” of personality, it would be difficult to characterize healthy personality in terms of trait concepts. Conversely, the diagnosis of personality disorders requires the existence of maladaptive behavior across diverse situations, which itself is a sign of personality pathology. This chapter discusses some caveats in adopting a dimensional model of personality disorders in the light of Mischel’s arguments, as his perspective is vital when working clinically with individuals with personality disorders. First, one should be cautious about over-diagnosing personality disorders. Second, because personality disorders are characterized by consistent problematic behavior, facet-level rather than domain-level characterization of personality is most clinically relevant from a third-person perspective. Third, personality trait domains do not illuminate the causes of problematic behavior in each individual, which is necessary for treating persons with personality disorders.
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