Isniah S, Hardi Purba H, Debora F. Plan do check action (PDCA) method: literature review and research issues . j. sist. manaj. ind. [Internet]. 2020Jul.31 [cited 2024May2];4(1):72-1. Available from: https://e-jurnal.lppmunsera.org/index.php/JSMI/article/view/2186