“Integration of Lean Six sigma in Reducing Waste in the Cutting Disk Process with the DMAIC, VSM, and VALSAT Method Approach in Manufacturing Companies” (2021) International Journal of Engineering Research and Advanced Technology (ijerat) (E-ISSN 2454-6135) DOI: 10.31695/IJERAT, 7(9), pp. 26–42. doi:10.31695/IJERAT.2021.3730.