Vending Machine Use Case Diagram

The use case diagram for the vending machine system outlines the interactions between two primary actors—Customer and Technician—and the system’s functionalities. Starting with the Customer, the diagram illustrates multiple points of engagement. The customer initiates the process by checking the product’s availability to ensure that the desired item is in stock. Once confirmed, the customer selects the product and decides between inserting cash or using a newly introduced card payment option, providing more flexibility for transactions. After completing the payment, the machine dispenses the selected product. If any issues arise during the transaction, the customer has the option to request a refund, adding an additional layer of consumer protection. Additionally, after completing the transaction, customers can provide feedback on the machine’s performance, which helps in improving future interactions and system updates. For the Technician, their responsibilities extend beyond merely restocking the machine. In addition to replenishing the inventory, the Technician is now responsible for performing system maintenance to ensure the machine operates efficiently. This includes diagnosing and addressing any technical issues that may arise, which is crucial for maintaining the machine’s overall functionality. This diagram employs ellipses to represent these use cases, with lines connecting actors to their respective actions. The visual representation highlights the workflows and interactions necessary for effective vending machine operation, ensuring a seamless experience for customers and efficient system management by technicians.