For the case study given below Identify all the actors, use cases and relationship also draw use case diagram.

A coffee vending machine dispenses coffee to customers. Customers order coffee by selecting a recipe from a set of recipes. Customers pay using coins. Change is given back if any to the customer. The service staff loads ingredients into machine. The service staff can also add a recipe by indicating name of coffee, units of coffee powder, milk, sugar, water and chocolate to be added as well as the cost of coffee.

Actors
1. Customer
2. Service Staff



Use Cases
1. Dispense coffee
2. Order
3. Pay coins
4. Payback
5. Load ingredients
6. Add recipe

Use Case Diagram

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