Although both dimensional and categorical approaches to an assessment of personality disorders (PD) exist, only instruments for a categorical approach to the assessment of PD have been developed. The reliability of the diagnostic assessment of PD could be improved by using questionnaires, checklists, and structured interviews. However, a comparison of structured interviews among themselves and with checklists or self-rating questionnaires showed only insufficient to satisfactory agreement. Therefore, there are no instruments for the assessment of DSM-III/DSM-IV and ICD-10 PD that could be clinically and scientifically interchanged. There is an increasing tendency to a dimensional approach to the assessment of PD.
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Bronisch et al. (1998) studied this question.
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