Fadhlilah, M., & Rochman, D. (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), 4239-4254. https://doi.org/10.37676/ekombis.v14i3.10065