A SYSTEMATIC PERSPECTIVE ON SUPPLY CHAIN IMPROVEMENT BY USING LEAN SIX SIGMA AND AN IMPLEMENTATION AT A FERTILIZER COMPANY

The purpose of this study is to review the supply chain processes of an enterprise using Lean Six Sigma tools and question the adequacy of the existing situation. The cost items in the supply chain of the company are discussed with the finance officers and listed as insurance expense, warehouse rent, financial expense and cost of spoiled goods. The DMAIC (Define, Measure, Analyze, Improve, Control) technique was used to decrease inventory time and inventory amount. By defining the current situation of the system in the Define phase, the process is analyzed with the SIPOC tool, and a CTQ diagram is created to determine the project metrics. In the Analyze phase, the average inventory is calculated using the Kanban method. Then, the reasons that increase the inventory are analyzed by a fishbone diagram, and after the necessary precautions, a control mechanism is established to prevent possible side effects of the project.