CHAPTER 3

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.

Attachments:

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