PENGURANGAN NON VALUE ADDED ACTIVITIES MENGGUNAKAN METODE LEAN SIX SIGMA: Elly Wuryaningtyas Yunitasari Program Studi Teknik Industri Fakultas Teknik Universitas Sarjanawiyata Tamansiswa, Yogyakarta, DIY, Indonesia. EJD. 2018;11(2):15-25. Accessed January 19, 2026. https://jurnal.ummu.ac.id/index.php/dintek/article/view/133