Sihombing EL, Ernawati D, Dewi S. Waste in Contract Document Preparation Using Lean Service . acopen [Internet]. 2026 Jul. 26 [cited 2026 Aug. 10];11(2):10.21070/acopen.11.2026.14079. Available from: https://acopen.umsida.ac.id/index.php/acopen/article/view/14079