Attention to school principals' managerial competencies and their development is an inescapable necessity, and failure to address these competencies in selecting principals leads to the loss of enormous financial and human resources as well as the dissatisfaction of the teachers and parents. The present study was conducted to explain and rank the competency criteria for school principals based on multiple fuzzy decision-making. This study has a combination exploratory design and is an applied study in terms of objectives and nature. A sample of 25 faculty members was selected for the interviews using network sampling and a random sample of 150 school principals was used for completing the managerial competencies questionnaire. To carry out the confirmatory analysis of variance, a random sample of 368 school principals was selected. The hierarchical structure of the competency criteria, including the main, individual, occupational and organisational criteria, 12 secondary criteria and 74 sub-criteria was then determined. Based on the final weight of the main criteria, occupational, individual and organisational competencies were ranked first to third.
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