1. Customer

• Initiates the pizza order.
• Selects pizza type, crust, toppings, and size.
• Can customize the order.
• May track the order or cancel it before preparation starts.

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2. Order Management System

• Handles creation, modification, and cancellation of orders.
• Coordinates with the kitchen to start pizza preparation.
• Maintains order history for customers.

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3. Kitchen Staff / Chef

• Receives orders from the system.
• Prepares the pizza based on specifications.
• Updates the order status (e.g., “Preparing”, “Ready”, “Dispatched”).

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4. Inventory System

• Maintains stock levels of ingredients (e.g., cheese, dough, toppings).
• Notifies when ingredients are low.
• Blocks an order if ingredients are insufficient.

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5. Delivery Executive

• Picks up the order from the kitchen once it’s ready.
• Delivers it to the customer.
• Updates delivery status (“Out for Delivery”, “Delivered”).

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6. Admin / Manager

• Manages menu items (add/remove/update pizza options).
• Views order statistics and manages staff roles.
• Monitors system health and inventory status.

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7. Payment Gateway (External System Actor)

• Processes online payments.
• Sends confirmation/failure status to the system.
• May provide refund APIs.

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Summary Table: