The present study is the design of a model for the development of school principals based on a competency-based approach (Case study: secondary schools in Tehran). The method of this research is applied in terms of purpose and has been done by the exploratory method. The data collection method is mixed (quantitative and qualitative) and the data collection tool is interviews with experts by conducting specialized interviews using the Delphi method and a questionnaire. After executing the questionnaire, data analysis in the qualitative part by coding method (open, axial and selective) and in the quantitative part analyzed the collected data in two descriptive and inferential methods through SPSS 16 and Smart PLS software. In this study, descriptive statistics including frequency, frequency percentage, frequency distribution table, and graphs and also describing the characteristics of the respondents to the questionnaire were used to describe the data. In inferential analysis, data analysis was performed using factor analysis. The results showed components: interpersonal, personality traits, operational management, cognition of the environment, parental involvement, professional knowledge, human resource management, and finally general knowledge because none of the components had a factor load of less than 0.3. They were not removed from the process of factor analysis and finally, all 8 components, with their indicators, were accepted under the title of dimensions and components of the development model of school principals based on the competency-based approach in secondary schools in Tehran. Pattern fit indicators in factor analysis confirm pattern to fit.
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