De Hautsmand, Floresta, and Enny Aryanny. 2025. “Analysis of Waste of Customer Service Time for New Installations With a Lean Service Approach at PT XYZ”. Indonesian Interdisciplinary Journal of Sharia Economics (IIJSE) 8 (1), 7996-8009. https://doi.org/10.31538/iijse.v8i1.6494.