“Study of Key Success Factors for Lean Six Sigma And Last Planner System In Basement Work On High-rise Residential Building Projects, Jakarta Indonesia” (2021) International Journal of Engineering Research and Advanced Technology (ijerat) (E-ISSN 2454-6135) DOI: 10.31695/IJERAT, 7(4), pp. 1–12. doi:10.31695/IJERAT.2021.3700.