The purpose of this article is to present an approach to defining, identifying, and assessing personality disorders, including the links between these definitions and personality assessment, with a particular reference to the proposed revisions to the personality disorders section of the American Psychiatric Association's Diagnostic and Statistical Manual of Mental Disorders (5th ed. [DSM-5]; American Psychiatric Association, 2013 ). The article discusses measures of maladaptive variants of the Five-factor model (FFM) that are coordinated with both the traditional personality disorder syndromes as well as the DSM-5 dimensional trait model. Discussed as well is the assessment of the more psychodynamically oriented deficits in sense of self and interpersonal relatedness that are also included within the hybrid model proposed for DSM-5.