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Muhammad Farrel Apta Fedora 2025. IMPROVING QUALITY IN ATM CARD PRODUCTION AT PT. DEF USING SIX SIGMA METHODOLOGY. International Journal of Economic, Business, Accounting, Agriculture Management and Sharia Administration (IJEBAS). 4, 6 (Jan. 2025), 1847–1855. DOI:https://doi.org/10.54443/ijebas.v4i6.2263.