情境
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.
這張圖裡有什麼
看懂背後的決策。
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.