OPTIMIZING SUPPLY CHAIN OPERATIONS USING LEAN AND SIX SIGMA METHODOLOGY

This research paper explores the integration of Lean and Six Sigma methodologies as a comprehensive approach to optimizing supply chain operations. In a global economy characterized by dynamic demand, increasing customer expectations, and cost pressures, businesses strive to improve efficiency while maintaining high quality. Lean focuses on waste elimination and streamlining processes, while Six Sigma emphasizes reducing variation and enhancing process control. The convergence of these two frameworks forms a robust strategy for continuous improvement in supply chains. This study aims to understand how their combined application can enhance supply chain performance by reducing lead times, increasing inventory turnover, improving supplier collaboration, and achieving higher customer satisfaction. The research is based on an empirical analysis of manufacturing and retail supply chains, supported by secondary literature and case evaluations. The paper highlights how value stream mapping, DMAIC, Kaizen, and statistical tools are employed to identify bottlenecks and implement actionable improvements. Results indicate that firms applying Lean Six Sigma (LSS) gain measurable benefits in cost efficiency, process agility, and service quality. However, challenges remain in terms of implementation complexity, employee training, and sustaining the cultural change required for continuous improvement. This paper adds value by bridging academic theory with real-world practice, illustrating how Lean Six Sigma can serve as a transformative driver for supply chain excellence in a competitive landscape.