Seham Ismail, A.S., As’arry, A., Sapuan, S.M. and Tarique, J. 2023. Improvement of Plastic Manufacturing Processes by Six Sigma and DMAIC Methods. Applied Science and Engineering Progress. 16, 3 (Aug. 2023), 6383. DOI:https://doi.org/10.14416/j.asep.2023.04.003.