Design and validate a model for the professional development of school principals in a mixed manner

The purpose of this study was to "design and validate a model for the professional development of school principals in a mixed manner". The research was applied in terms of purpose and mixed method. The statistical population of this study in the qualitative section included educational management experts. First, in this section, with a deep study of the theoretical foundations and background of the research presented on the subject of research in both internal and external sectors, the components of professional development of school principals were identified. Then, semi-structured interviews were conducted with purposeful sampling method and each interview was coded through NVivo software. This process continued until the researcher reached theoretical saturation. The statistical population of the high school principals in the provinces of Tehran province is 2711 people that were selected by Cochran formula of 385 samples by multistage cluster sampling. The data collection tool was a researcher-made questionnaire for quantitative determination of face status and desirability. Its face and content validity was confirmed by 10 experts in management and educational leadership and its reliability was measured by Cronbach's alpha coefficient (0.864). And combined reliability (0.899) is achieved. The results showed that the professional development of managers has eight components: "organizational factor", "policy factor", "economic factor", "cultural factor", "value factor", "social factor", "individual factor" and "technology factor". That is, in professional development, managers explain 80% of the variance. On the other hand, the status of organizational and policy components was lower than average and undesirable and the other components were average and far from optimal. Finally, the research model was formulated based on the philosophy and goals of the model, the theoretical foundations, and factors influencing the professional development of managers, which was confirmed with 99% confidence