Carrefour Hypermarket has assigned a project to your company to develop their Warranty Management

System $($WMS$),$ which will serve as a platform where customers can claim warranties for the purchased

electronic appliances and check the status of their warranty claims.

WMS will be used by different stakeholders that are:

$$ Customers

$$ Warranty Coordinators

$$ Drivers

$$ Service Center Officers

A customer fills the warranty claim by uploading the warranty invoice and providing a description of the

malfunction. WMS notifies the warranty coordinator about it$.$ A warranty claim contains exactly one

warranty invoice, whereas a warranty invoice may be associated to many claims. An invoice is related to

exactly one product and a product has exactly one warranty invoice.

A warranty coordinator processes the warranty claim. He verifies the warranty claim validity by checking

its description and comparing the invoice date with the warranty claim date. If the product is still under

warranty, then WMS notifies the customer about product$$s pickup date and time. Driver and service

center officer are also notified. If the warranty claim is not valid, then the customer is notified about the

invalidity of the warranty claim.

Driver picks up the product on a specified date and time, drops it at the service center, and updates the

warranty claim status accordingly. The service center officer repairs the product, and updates the

warranty claim status. Once the repairing is completed, WMS notifies the driver about the pickup date

and time. It also notifies the customer about the product's delivery date and time. The driver picks up the

product and drops it at the customer.