Fadhlilah, Muhammad, and Didit Rochman. 2026. “Decrease in Operational Efficiency at PT X: Causes and Improvements With Lean Six Sigma DMAIC”. EKOMBIS REVIEW: Jurnal Ilmiah Ekonomi Dan Bisnis 14 (3), 4239-54. https://doi.org/10.37676/ekombis.v14i3.10065.