EFFECTIVITY IMPROVEMENT OF HYBRID PROJECT MANAGEMENT WATER-SCRUM-FALL WITH SIX SIGMA IMPLEMENTATION. jitk [Internet]. 1 Agustus 2024 [dikutip 11 Februari 2026];10(1):124-31. Tersedia pada: https://ejournal.nusamandiri.ac.id/index.php/jitk/article/view/5539