The assignment content discusses the importance of quality control in managing key accounts, emphasizing the need for effective planning and management to ensure customer satisfaction and loyalty. It highlights various models and tools that can be used to evaluate and improve quality control, such as Deming's PDCA cycle, Just-in-Time, Six Sigma, and EFQM. Additionally, it emphasizes the importance of developing a succession plan for maintaining successful relationships with key customers, evaluating systems for storing and planning major customer information, and implementing strategies for addressing any issues that may arise during strategic relationship activities.