1. The context diagram shows the key external entities that interact with the order system - customers, warehouse, and accounting. It displays the major information flows between these entities and the system.
2. The level-0 DFD of the order system contains 5 main processes: 1) check status, 2) issue status messages, 3) generate shipping order, 4) manage accounts receivable, and 5) produce reports. It also includes 2 data stores - pending orders and accounts receivable - and displays the high-level data flows between the entities, processes, and data stores.
1. The context diagram shows the key external entities that interact with the order system - customers, warehouse, and accounting. It displays the major information flows between these entities and the system.
2. The level-0 DFD of the order system contains 5 main processes: 1) check status, 2) issue status messages, 3) generate shipping order, 4) manage accounts receivable, and 5) produce reports. It also includes 2 data stores - pending orders and accounts receivable - and displays the high-level data flows between the entities, processes, and data stores.
5. อุปกรณ์ร ับเข้า (Input Devices)
•แผงแปนอ ักขระ(Keyboard)
้
แปนอักขระ(Character Key) แปนกาหนดหน้าที่(Function Key)
้ ้
Print Scroll Num Caps Scroll
Esc F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12 Screen Lock
Pause Lock Lock Lock
~ ! @ # $ % ^ & * ( ) + Num
Backspace Insert Home Page
Lock
/ *
` 1 2 3 4 5 6 7 8 9 0 = Up
Tab Q W E R T Y U I O P { } | Delete End Page 7 8 9
[ ] Down Home PgUp
+
Caps A S D F G H J K L : " 4 5 6
Enter
Lock ; '
Shift Z X C V B N M < > ? Shift 1 2 3
, . / End PgDn
Enter
0 .
Ctrl Alt Alt Ctrl
Ins Del
แปนควบคุม (Control Key) แปนตัวเลข (Numeric Key)
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