Satitpongsa, S., Santawan, T. and Tawee, S. 2024. The Factors Affecting an Implementation of Internal Quality Assurance in the Schools of Educational Opportunity Expansion School under the Nakhon Sawan Primary Educational Service Area Office 3. Education journal Faculty of Education, Nakhon Sawan Rajabhat University . 7, 3 (Dec. 2024), 29–43. DOI:https://doi.org/10.2774.EDU2024.3.267485.