Considering the need for campus takeout ordering in real life and careful analysis of the system, the system permissions are divided into three categories: administrator, user, and employee.<br>(a) Administrator; The main functions involved by administrators in using this system include: homepage, personal center, user management, employee management, supplier management, product classification management, product information management, product inventory management, product procurement management, product warehousing management, product outbound management, product return management, system management, order management, and other functions. The administrator Use Case Diagram is shown in Figure 3-1.
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