Translation and Cross-Cultural Adaptation of the Individual Work Performance Questionnaire (IWPQ) into Persian and Assessing its Psychometric Properties

Marzieh Izadi  Laybidi; Mohammad  Asghari-Jafarabadi; Azam  Maleki-Ghahfarokhi; Elham  Entezarizarch; Mojtaba Khosravi  Danesh

doi:10.18502/jhsw.v15i1.21361

Marzieh Izadi Laybidi Department of Ergonomics, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
Mohammad Asghari-Jafarabadi Cabrini Research, Cabrini Health, Malvern, VIC, 3144, Australia
Azam Maleki-Ghahfarokhi School of Public Health and Safety, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Elham Entezarizarch Department of Industrial and Systems Engineering, University at Buffalo, Buffalo, USA
Mojtaba Khosravi Danesh Department of Occupational Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran

DOI: https://doi.org/10.18502/jhsw.v15i1.21361

Keywords: Job performance, IWPQ, Scale translation, Psychometrics, Construct validity, Farsi

Abstract

Introduction: Individual work performance (IWP) plays a crucial role in both organizational effectiveness and employee well-being. To address the limitations of existing job performance questionnaires, the Individual Work Performance Questionnaire (IWPQ) was developed based on a holistic and systematic framework. This study aimed to translate, culturally adapt, and evaluate the psychometric properties of the Persian/Farsi version of the IWPQ.
Material and Methods: This descriptive methodological study was conducted in two stages: (1) translation and cultural adaptation (assessment of face and content validity), and (2) psychometric evaluation (assessment of internal consistency, test-retest reliability, and construct validity). The sample consisted of 206 administrative employees with a mean age of 34.29 years (SD = 7.66) and an average work experience of 8.48 years (SD = 7.39). The IWPQ was translated using forward and backward translation methods, and its validity was evaluated using exploratory and confirmatory factor analyses.
Results: The Persian IWPQ demonstrated acceptable face and content validity. Exploratory factor analysis confirmed a three-factor structure: task performance, contextual performance, and counterproductive work behavior. Confirmatory factor analysis indices (e.g., CFI = 0.87, SRMR = 0.08 and RMSEA = 0.09) indicated a approached model fit acceptability. Internal consistency and test-retest reliability were satisfactory across all dimensions (Cronbach’s alpha > 0.70 and ICC > 0.80).
Conclusion: The Persian version of the IWPQ is a reliable and valid instrument for assessing individual work performance across diverse occupational groups. It provides a valuable resource for evaluating workplace interventions and strategies aimed at enhancing performance.