This report provides a comprehensive analysis of operations, quality, and supply chain management within various industries. It critically evaluates business operations in companies like Toyota, McDonald's, and Marriott International, examining how operations management supports business objectives. The report delves into the application of lean techniques, process improvements, and the crucial role of customer service in each organization. It also scrutinizes different quality models, such as TQM and Six Sigma, assessing their advantages and disadvantages. Furthermore, the report explores supply chain theories, the importance of logistics, and the requirements for effective contract management. The report highlights the financial and goodwill impacts of customer service, emphasizing the importance of satisfying customer needs through value-added services. By examining these elements, the report provides a detailed overview of how these elements contribute to business success.