Tiwthong, P., Phanoy, S. and Wicharapote, J. 2025. The Competency of School Administrators Affecting the Effectiveness of School Administration under Nong Bua Lamphu Primary Educational Service Area Office 1. Interdisciplinary Academic and Research Journal . 5, 6 (Nov. 2025), 23–38. DOI:https://doi.org/10.60027/iarj.2025.286914.