Tehran University of Medical Sciences Iranian Journal of Public Health 2251-6085 51 11 2022 11 09 2582 2591 Shahin Amani Department of Preschool Education, Faculty of Educational Sciences and Social Welfare, University of Social Welfare and Rehabil-itation Sciences, Tehran, Iran Zahra Abbasi Dolatabadi Department of Medical Surgical Nursing, School of Nursing and Midwifery, Tehran University of Medical Sciences, Tehran, Iran Tayebeh Ilaghinezhad Bardsiri Department of Nursing, Sirjan University of Medical Sciences, Sirjan, Iran Mahdi Nouri Department of Occupational Health and Safety Engineering, School of Health, Ahvaz University of Medical Sciences, Ahvaz, Iran Jebraeil Nasl Saraji Department of Occupational Health and Safety Engineering, School of Health, Tehran University of Medical Sciences, Tehran, Iran Mohsen Poursadeqiyan Department of Occupational Health and Safety Engineering, School of Health, Ardabil University of Medical Sciences, Ardabil, Iran Behzad Khedri Department of Social Work, Social Studies Faculty, Hanze University of Applied Science, Groningen, Netherlands Abdollah Mohammadzadehaghdam Department of Preschool Education, Faculty of Educational Sciences and Social Welfare, University of Social Welfare and Rehabil-itation Sciences, Tehran, Iran Zahra Zamani Department of Pediatric Nursing, Isfahan University of Medical Sciences, Isfahan, Iran Mansoureh Karimzadeh 1. Department of Preschool Education, Faculty of Educational Sciences and Social Welfare, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran 2. Pediatric Neurorehabilitation Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran 2021 07 19 2021 10 06 Background: The role of preschool administrators in raising children is increasing day by day, so the purpose of this study was to detect the validity and reliability of the professional competency questionnaire and its psychometric assessment in preschool administrators. Methods: This descriptive study was conducted on 380 preschool administrators with a minimum age of 25 and a maximum of 65 year participated in 2018. The sampling method was stratified from four regions of north, south, west and east of Tehran, Iran. Rosenberg self-esteem questionnaire was used for convergent validity. Cronbach's alpha coefficient was used to examine the internal consistency. Face validity, content validity and structural validity were also calculated. The data collection tool was a researcher-made questionnaire. Results: The questionnaire of professional competency of preschool administrators was appropriate in terms of face validity. Indicators related to content validity were appropriate in terms of relevance, transparency and necessity in this study. Cronbach's alpha coefficient was 0.98. The correlation between the total score of the managers' professional competency test and self-esteem was equal to 0.08 with a significance level of 0.58. Conclusion: The professional competency questionnaire of preschool administrators had good validity and reliability to assess the level of professional competency of preschool administrators. Researchers can use this questionnaire to assess the professional competency of preschool administrators.   https://ijph.tums.ac.ir/index.php/ijph/article/view/25616 https://ijph.tums.ac.ir/index.php/ijph/article/download/25616/7784