電線電纜產業之個案研究 / The importance of supply chain management continues to grow as managers increasingly understand how effective supply chains enhance the ability to compete effectively in the market place. This paper presents a case study of a wire & cable manufacturing firm in China that undertakes its journey of supply chain management (SCM) transformation through Sales and Operations Planning (S&OP) project implementation. The aim was to provide a real-life case example of a supply chain improvement process as presented from a practitioner’s perspective. A supply chain division was just newly established in the case study company and its supply chain journey was still in its infancy, and that made the company’s transformation process become very challenging. Unlike a traditional case study report focusing on a single project implementation only, this paper describes the whole improvement cycle starting with underlying supply chain issues identification and prioritization throughout the processes of project selection and implementation. This study exemplifies how a company finalized and realized its supply chain strategic direction through a systematic approach. Supply-Chain Operations Reference (SCOR) model was used in the beginning to conduct a high-level assessment on supply chain opportunities and various brainstorming tools were applied in order to identify the issue with the greatest impact to the organization. Sales and Operations Planning or S&OP is another key element, and a thorough literature review supplemented with practical application is demonstrated in this paper. Little information technology application is presented. Instead, this case focuses more on change management and business process engineering.