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CIS 372 DFD Business Scenario: Acme has a store in Carson

Electrical Engineering

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CIS 372

DFD

Business Scenario:

Acme has a store in Carson. Customers come into the store and browse the catalog of products. Once they have located the product they would like to purchase, they can take the unique identification number each product has and enter it into the inventory devices on the shop floor. By entering the number, the system will be able to show the customer the details of the product, whether it required home delivery and how many are left in stock. If the customer wants to purchase the product, they fill in a slip of paper with the identification code and the desired quantity and queue for the check-out and give it to the sales assistant. At the check-out, the sales assistant will take the slip and input the identification number into the system via their keyboard. If it shows that there are still some of the products in stock, the customer will be asked for payment (cash, or credit card). Once the transaction 1s complete it is saved to the transaction file and the customer will be given a receipt which also shows what counter they should collect the product at and an approximation of how long they will be waiting. In the stock room as transactions occur, staffs are notified of the product and quantity and will search the stock room and bring the product to the counter for collection. They will input into the system that the order has been filled and that the customer can collect it (the product catalog will be amended for stock level); the overhead screen will indicate to the customer that they may collect their order and at which counter. The customer may then pick up the product and leave the store. Periodically, as products are purchased the stock will run out (stock levels will be checked) and will have to be reordered from the supplier. Acme uses a wide number of suppliers so they keep a list of their contact details and the products they supply. Acme records all details relating to orders in the product-order file, this can be used to verify incoming orders later. The supplier receives a batch order for products periodically which they will fill and notify Acme of the delivery time and cost.

Context Diagram:

The following is the context diagram that I created for you.

Product ordered & quantity                                    Stock room

Customer order filled

Product ID                                        0                       Customer order filled

Product purchase ID #s                Acme POS               Order filled/estimated delivery date

Payment                                          System

Product Order

Order ready for collection

Receipt | oup plier

Customer Products in stock

Product details/stock ‘delivery

Your Tasks:

 

(1) Decompose the context diagram into more detailed levels (at least a level 0 diagram. But if you think you need to further decompose it to level 1 diagram, it is fine too).

(2) For each of the primitive DFD processes you have in (1), write the process descriptions using Structured English or pseudo code. For instance, 1f you have 5 primitive DFD processes, then you need to write 5 process descriptions, one for each DFD process. You don’t need to worry about the syntax. Just write down the steps, as 1f you were writing a recipe.

How to Submit:

Use Lucidchart (see the tutorial and link to Lucidchart in the navigation pane of the course site) to create the diagram. When you are done, copy and paste the diagram in a Word document. Type up your explanations and the process descriptions. When you are done, submit the document in Bb.