TY - JOUR AU - asadi, amirsadra AU - Hajipoor abaei, najmeh AU - manzari, Hamdollah AU - zeinaddini, zahra TI - Designing and validating the competency model of secondary school principals in order to realize schools without failure: the case study of Kerman city JO - Curriculum Development and Educational Planning Research VL - 17 IS - 1 SP - EP - PY - 2025 DO - ER -