Concurrent Validity of the Shedler-Westen Assessment Method and the Millon Clinical Multiaxial Inventory-IV in a Non-Clinical Sample from the Iranian Oil Industry

Sodeh Ali Bakhshian; Reza Sarafraz; Mohamad Reza Belyad; Kambiz Kamkari; Mehdi Haji Heydari

Authors

Sodeh Ali Bakhshian PhD Student, Department of Psychology, Karaj Branch, Islamic Azad University, Karaj, Iran. Author https://orcid.org/0009-0002-8510-4257
Reza Sarafraz Assistant Professor, Department of Clinical Psychology, Shiraz University, Shiraz, Iran. Author https://orcid.org/0009-0005-2319-1529
Mohamad Reza Belyad Assistant Professor, Department of Psychology, Karaj Branch, Islamic Azad University, Karaj, Iran. Author https://orcid.org/0009-0000-8878-0782
Kambiz Kamkari Associate Professor, Department of Psychology, Islamshahr Branch, Islamic Azad University, Islamshahr, Iran. Author https://orcid.org/0009-0003-4940-4479
Mehdi Haji Heydari PhD student, Department of Public Administration, Roudehen Branch, Islamic Azad University, Roudehen, Iran. Author https://orcid.org/0009-0002-2871-5246

Keywords:

Concurrent validity, Shedler-Westen Assessment Method, non-clinical sample, Iranian oil industry

Abstract

Purpose: The study aims to evaluate the concurrent validity of the Shedler-Westen Assessment Procedure (SWAP-200) and the Millon Clinical Multiaxial Inventory-IV (MCMI-IV) in a non-clinical sample from the Iranian oil industry. Methods and Materials: The research utilized Pearson’s product-moment correlation model to assess the relationship between the scales of the Shedler-Westen Assessment Procedure and the Millon Clinical Multiaxial Inventory-IV. The study sample consisted of employees from the Iranian oil industry who participated in a psychological evaluation for managerial or contract promotion purposes. Findings: The results demonstrated significant positive correlations between the scales of the SWAP-200 and the MCMI-IV, with correlation coefficients of 0.60 or higher at α = 0.01 and α = 0.05 levels. This indicates that both tools have strong concurrent validity in measuring personality disorders. Conclusion: The study confirms that the Shedler-Westen Assessment Procedure and the Millon Clinical Multiaxial Inventory-IV exhibit concurrent validity in a non-clinical sample, supporting their effectiveness in assessing personality disorders in organizational contexts.