According to dimensional models personality disorders are clinical psychology timothy trull pdf free download according to which characteristics are expressed at which levels. A number of dimensional models have been produced, differing in the way in which they are constructed and the way in which they are intended to be interpreted. Representation based on integration of dimensional modals, e.
Alternative DSM-5 Model for Personality Disorders. In contrast the dimensional approach has been shown to predict and reflect current diagnostic criteria, but also add to them. It has been argued to be especially useful in explaining comorbidity which is often high for patients diagnosed with a personality disorders. However one of the issues in using a dimensional approach to diagnosis has been determining appropriate cut off points so as to know who belongs to the category of people requiring treatment, this is partly why both categorical and dimensional diagnoses are included. Since the categorical model is widely used in clinical practice and has a significant body of research supporting it, its common usage is compelling to laypeople when they are judging the credibility of professional opinion.