Tech. Suhaila Juma Radi, Asst. Tech. Afrah Oudah Sabeeh and Prof. Dr. Safaa Mohammed Hadi 2023. USING WAITING LINES THEORY TO SOLVE THE PROBLEM OF WAITING A CASE STUDY IN THE NATIONAL BANK OF IRAQ. World Economics and Finance Bulletin. 19, (Feb. 2023), 183-191.