Ahmad Tajudin, Mohd Khairil Amri. “Six Sigma (DMAIC) Practices In School Discipline Management System”. Jurnal Kejuruteraan, Teknologi and Sains Sosial (JKTSS), vol. 7, no. 3, July 2024, https://jktss.puo.edu.my/jurnalpuo/index.php/jurnal/article/view/88.