Al-Hamdani AMS, Mohammed AM. Requirements Applying of Six Sigma Methodology to Reduce Productive Wastage at Yemeni Pharmaceutical Manufacturing Companies: A Field Study . J Soci Stu [Internet]. 2024 Mar. 28 [cited 2025 Jan. 8];30(1):30-59. Available from: https://journals.ust.edu/index.php/JSS/article/view/2337