The scenario
An online grocery store system where customers browse products, place orders, and track deliveries, while administrators manage stock and assign deliveries, with handling of payment failures and out-of-stock items.
What is in this drawing
Read the decisions behind it.
01
Including Checkout, Pay, and Track Order as distinct use cases with include/extend relationships to modularize the order flow.
02
Modeling Payment Gateway and Delivery Service as external actors for clear system boundaries.
03
Using extension points on Checkout for payment failure and out-of-stock events to show exceptional flows.
Applicable for e-commerce platforms that need to model order processing, inventory management, and delivery coordination with modular use case decomposition and extension for error handling.
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