🎓 Student Projects (College Reports) · Data Flow
Library Management System Data Flow Diagram (Level 1)
How data moves through a library system: members and the librarian, the main processes, and the data stores they read and write.
Drawing diagram…
What this diagram shows
- External entities, processes and data stores in separate groups
- Numbered data flows, as examiners expect
- Covers search, issue, return and fines
Prompt used
Level 1 data flow diagram for a library management system: members send search requests and borrow/return requests; the librarian registers members and adds books. Processes: manage catalogue, search books, issue book, return book and calculate fine, manage members. Data stores: books, members, loans and fines. Overdue notices go back to members.
Mermaid code
flowchart LR
subgraph EXT ["🌐 External Entities"]
M["Member"]
LB["Librarian"]
end
subgraph PROC ["⚙️ Core Processes"]
P1["1.0 Manage catalogue"]
P2["2.0 Search books"]
P3["3.0 Issue book"]
P4["4.0 Return book and calculate fine"]
P5["5.0 Manage members"]
end
subgraph STORE ["🗄️ Data Stores"]
D1[("D1 Books")]
D2[("D2 Members")]
D3[("D3 Loans")]
D4[("D4 Fines")]
end
LB -->|"1. New book details"| P1
P1 -->|"2. Book record"| D1
M -->|"3. Search query"| P2
D1 -->|"4. Matching books"| P2
P2 -->|"5. Search results"| M
M -->|"6. Borrow request"| P3
D2 -->|"7. Member status"| P3
P3 -->|"8. Loan record"| D3
M -->|"9. Returned book"| P4
D3 -->|"10. Due date"| P4
P4 -->|"11. Fine record"| D4
P4 -->|"12. Fine notice"| M
LB -->|"13. Member details"| P5
P5 -->|"14. Member record"| D2Related templates
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Library Management System ER Diagram
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