TY  - JOUR
AU  - Farhadfar, Mozhgan
AU  - delkhosh kasmayi, abolghasem
AU  - Safari, Mahmoud
TI  - Providing a Model to develop a model for school principals based on a competency-based approach  (Case Study: Tehran Secondary School
JO  -  Quarterly Journal of Training and Development of Human Resources
VL  - 8
IS  - 30
SP  - 73
EP  - 108
PY  - 2021
DO  - 10.52547/istd.31103.8.30.73
ER  -