Norshazwana Akmal Hanafi, Tan Owe Kowang, and Goh Chin Fei. “CATEGORIZATION OF LEAN SIX SIGMA TOOLS AND TECHNIQUES BASED ON DMAIC FRAMEWORK”. JOURNAL INFORMATION AND TECHNOLOGY MANAGEMENT (JISTM) 4, no. 13 (July 9, 2019): 01–12. Accessed June 22, 2025. https://gaexcellence.com/jistm/article/view/1078.