Prepare systems flowcharting segments and labels for the following operations:
Update an airline reservation on a web-based airline reservation system from a home computer.
A scheduled automatic back-up of an internal hard drive to an external hard drive
Processing OCR documents online to update a database on magnetic disk.
A report is prepared from data stored on magnetic tape.
Billing data are entered online and used to update the sales order file and the customer master file.
Reading data from a disk file into the computer to be printed on a report.
Access a price list maintained on a disk to complete a purchase order. An electronic copy of the purchase order is sent to the vendor and a backup copy is printed and filed by vendor name.
Enter employee hours worked data from time cards to the payroll transaction file maintained on a disk and match to wage data maintained on the payroll master file.
A sales invoice is prepared manually and sent to a customer.
An error listing and batch total are compared and filed.
A sales order is prepared manually.
SYSTEMS DEVELOPMENT AND DOCUMENTATION TECHNIQUES
SUGGESTED ANSWERS TO DISCUSSION QUESTIONS
3.1 Identify the DFD elements in the following narrative: A customer purchases a few items from a local grocery store. Jill, a salesclerk, enters the transaction in the cash register and takes the customer’s money. At closing, Jill gives both the cash and the register tape to her manager.
Data Flows: merchandise, payment, cash and register tape
Data Source: customer
Processes: capture sales and payment data and collect payment, give cash and register tape to manager
Storage: sales file (register tape), cash register
3.2 Do you agree with the following statement: “Any one of the systems documentation procedures can be used to adequately document a given system”? Explain.
It is usually not sufficient to use just one documentation tool. Every tool documents a uniquely important aspect of a given information system. For example, system flowcharts are employed to understand physical system activities including inputs, outputs, and processing. In contrast, data flow diagrams provide a graphic picture of the logical flow of data within an organization.
Each alternative is appropriate for a given aspect of the system. As a result, they work together to fully document the nature and function of the information system.