Information Technology Reference
In-Depth Information
Fig. 13.4
Symbols used in
DFDs
Now let us model the purchase order transaction using a DFD. Let us first
enumerate the steps in the process which we can model pictorially. Here is the
simplified process:
1.
An executive from the production department or warehouse raises a pro-
curement requisition on to the purchase department for purchase of item or
items.
2.
The purchase department receives the requisition and files it (stores it).
3.
The purchase department
raises
enquiries on vendors asking for price
quotations.
4.
The vendors receive the enquiry and stores it.
5.
The vendors transmit price quotes to the purchase department.
6.
The purchase department receives the quotes and stores them.
7.
The purchase department transmits the quotes to the executive who originated
the procurement requisition.
8.
The executive selects the vendor and sends the recommendation to the pur-
chase department.
9.
The purchase department stores the recommendation.
 
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