O cenário
A library management system where patrons borrow books. This Level 1 DFD shows the main process 'Borrow Book' interacting with the Patron external entity and the Book Inventory data store.
O que há neste desenho
Entenda as decisões por trás dele.
01
No conditional branches; continuous data flows between entities, process, and store.
When modeling the top-level data flows of a library borrowing system; can be extended for more detailed processes.