Journal of Personality Disorders, 29, 2015, 231 © 2015 The Guilford Press 1 From Department of Psychology, Milan Bicocca University, Milan, Italy (E. S. G., M. L.); Department of Psychological Sciences, Purdue University, West Lafayette, Indiana (D. B. S.); and Associazione per la Ricerca in Psicologia Clinica - A.R.P., Milan, Italy (M. L.). We deeply thank the patients, clinicians, and staff of the Associazione per la Ricerca in Psicologia Clinica (A.R.P., Milan, Italy) where this study was conducted for the time and knowledge they shared with us. We also acknowledge all the colleagues with whom we had the opportunity to productively discuss over the years about the main topics discussed in this work. Margherita Lang served as a co-editor for the Italian version of the MCMI-III and as such receives royalties for its use. No funding was received for this research. Address correspondence to Emanuela S. Gritti, Department of Psychology, Milan Bicocca University, Piazza dell’Ateneo Nuovo 1, Milan 20126, Italy; E-mail: emanuela.gritti@unimib.it DIAGNOSTIC AGREEMENT BETWEEN CLINICIANS AND CLIENTS: THE CONVERGENT AND DISCRIMINANT VALIDITY OF THE SWAP-200 AND MCMI-III PERSONALITY DISORDER SCALES Emanuela S. Gritti, PhD, Douglas B. Samuel, PhD, and Margherita Lang, PsyD A particularly controversial aspect in the feld of personality assessment is the use of self-report measures, versus clinicians’ evaluations, for diagnosing personality disorder (PD). No studies have systematically documented the agreement between these sources for the entire array of DSM-5 PDs using comprehensive measures and experienced clinicians’ judgments. The present work flls this gap by indexing the agreement between patients’ self-descriptions and clinicians’ judgments, relying on standardized and thorough PD instruments. The Shedler-Westen Assessment Procedure–200 (SWAP-200; Westen & Shedler, 1999a, 1999b) and the Millon Clinical Multiaxial Inventory-III (Millon, Davis, & Millon, 1997) were both completed in a clinical series of 56 adult outpatients. Analyses highlighted moderate correlations between the two measures for the 10 DSM-5 PDs (Mdn = .35). Agreement was highest for psychological features that are more easily observable by the clinicians. Furthermore, results revealed problematic discriminant validity between the two instruments. The diagnosis and assessment of personality disorders (PDs) has traditionally been a thorny issue that has created complications. Within practice settings, PD diagnoses are primarily assigned by treating therapists based on their clinical interactions and unstructured interviews with the patient (Perry, 1992; Westen, 1997). Nonetheless, the past three decades have seen a proliferation G4361_231.indd 1 11/23/2015 9:39:10 AM