The number of overlapped symbols should equal the

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together in a flowchart. The number of overlapped symbols should equal the number of document copies that are moving together. The name of each document, as well as the copy number, is written on each overlapped symbol. R4. What is the difference between online processing and real-time processing? Can processing be both online and real-time? Can processing be online without being real-time? Online processing means the computer-input device is connected to the CPU so that master files can be updated as transaction data are entered. Real-time processing means master files are updated as transactions occur so an immediate response may be given to an information user in time to affect the outcome of the event. Real-time processing generally requires online processing; however, online processing does not guarantee real-time, since transaction data may be entered long after the transactions actually occur. R5. Draw the data flow diagram symbols and describe the use of each. Data-flow diagrams include four symbols: process, data inflow sources and report outflow destinations, data stores, and data-flow lines. Like flowcharting, there are slight variations on some of the symbols. 1. Process -Circles are used to represent processes that take data inflows and transform them to information outflows. The name or description of the process in verb form is used to label the circle. The verb is followed by an object, such as Record order data in Exhibit 5-9, process 1.1.4. Solutions Manual to accompany Dunn, Enterprise Information Systems: A Pattern Based Approach, 3e 48
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Chapter 5 2. Data-Inflow Sources and Information Outflow Recipients - Rectangles (or squares) represent data-inflow sources and information outflow recipients. Each type of data flowing into the process and its source is represented as a line from a rectangle to the circle representing the process. The rectangle is labeled with the name of its sources (e.g. Customer, Vendors, Government Agency) and the line is labeled with the name of the data-flow (e,g, Order, Bill, Assessment). Each flow of information exiting the business process is represented as a line and its recipient as a box. As with data inflows and sources, the information outflow and its recipient are also labeled. 3. Data-Flow Lines - Data-flow lines display the route of data inflow and information outflow. They can be straight or curved lines. The data-flow is generally labeled and the arrow indicates the direction of the data flow. If data flow lines are used to connect a process to a data store where the data store contains the same name as the data flow, no label is required on the flow line. 4. Data Stores - Two parallel straight lines 1 are used to display a store or collection of data. A description of the data store contents is entered on the symbol. Data stores are used anytime it is necessary to store the output from a process before sending it on to the next process.
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