Minicase #2 Chapter 5 "Systems Analysis and Design 7th Edition by Alan Dennis, Barbara Haley Wixom, Roberta M. Roth

In this exercise, you will explode an event handling process into a level 1 DFD. The exercise focuses on the process used to complete a purchase at the selfcheckout lane at a retail store. The basic process should be familiar to you. To simplify the scenario, we assume that only credit/debit card payments are allowed in this lane (no cash, checks, or food stamps). We start with a DFD fragment that has been created for this situation. This fragment shows one eventhandling process and the data flows it receives and sends to external entities and data stores. This fragment was extracted from the Level 0 diagram to help us focus just on this event.

The event handling process includes four subprocesses:

1.1 Process purchase items

1.2 Update inventory on hand

1.3 Process payment

1.4 Record sales transaction details.

Draw the level 1 diagram for Process 1. Use the suggested subprocesses listed above as the process components of the level 1 diagram. Remember that all data flows and data stores on the parent diagram must also appear on the child diagram, but you will likely add more data flows on the child diagram.

CC Payment Credit Card Clearing House CCCH Response 1 D1 Items Customer Item UPC Amount Due Payment- Receipt Check Out Process Item UPC +Item Details Items Purchased Debit Payment D2 Inventory On Hand D3 Sales Transactions Final -Transaction Details ACH Response Automated Clearing House