Design Coffee Machine

Brew Coffee

• Use Case: The user selects a coffee type and size, and the machine brews the coffee accordingly.
• Functional Requirement: The machine should support multiple coffee types (e.g., espresso, cappuccino, latte) and sizes (small, medium, large).
• Non-Functional Requirement: The brewing process should not exceed 2 minutes.

User Interface

• Use Case: The user interacts with the machine through a touch screen to select options and receive feedback.
• Functional Requirement: The interface should display available coffee options, sizes, and prices.
• Non-Functional Requirement: The interface should be intuitive and responsive, with a response time of less than 1 second.

Payment Processing

• Use Case: The user pays for the coffee using a credit card or mobile payment.
• Functional Requirement: The machine should support multiple payment methods, including credit/debit cards and mobile payments (e.g., Apple Pay, Google Pay).
• Non-Functional Requirement: Payment processing should be secure and complete within 5 seconds.

Maintenance Alerts

• Use Case: The machine notifies the operator when maintenance is required, such as refilling ingredients or cleaning.
• Functional Requirement: The machine should track ingredient levels and usage to predict when maintenance is needed.
• Non-Functional Requirement: Alerts should be sent in real-time to the operator's mobile device or email.

Temperature Control

• Use Case: The machine maintains the optimal temperature for brewing different types of coffee.
• Functional Requirement: The machine should adjust the water temperature based on the selected coffee type.
• Non-Functional Requirement: Temperature adjustments should be precise within a range of ±2°C.