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An online computer parts retailer needs to track customer orders, product catalog, inventory levels across warehouses, and payments while supporting multiple product types such as CPUs and GPUs.
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01
Used an abstract Product class with IProduct interface to support multiple component types.
02
Modeled Order-to-OrderLine as composition with 1..* multiplicity.
03
Linked InventoryItem to Product and Warehouse to track stock per location.
Reusable for any retail system needing order processing, product catalog inheritance, and multi-warehouse inventory tracking.