Sharifi Feriz Z, Zeraatpishe M, Ashraf H, Zohoorian Z. Development and Validation of a Collaborative Continuing Professional Development (CCPD) Questionnaire for EFL Teachers: A Qualitative–Quantitative Study. ECS. Published online June 1, 2026:1-15. Accessed October 31, 2025. https://iase-ijeas.com/index.php/ecs/article/view/306