Solutions Chapter 4

Solutions Chapter 4 - Solutions to HWK Problems Ch 4 DQ4-1...

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Solutions to HWK Problems Ch 4 DQ4-1 “Data flow diagrams and systems flowcharts provide redundant pictures of an information system. We don’t need both.” Discuss. ANS. Logical data flow diagrams (DFDs) present only the logical elements of an information system. By excluding the physical elements, the logical DFD allows us to concentrate on what a system is doing without being distracted by how the functions are being performed and by whom . Physical DFDs present the physical elements of an information system. They concentrate on who or what is acting on the data flowing through the system. Physical DFDs allow us to concentrate on the entities involved in processing information. We can also see how much work is done by an entity by observing the flows into and out of an entity and whether those flows change names, which is an indication that they have been transformed within the entity. Finally, a flowchart presents the logical and the physical details of an information system’s functions and related operations activities. It shows the details of how a process is accomplished and also shows the organizational unit that performs the process. As we will see in Chapter 9, these details are necessary to permit
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This note was uploaded on 02/23/2010 for the course ACG ? taught by Professor Bline+pascaerlla during the Spring '10 term at Bryant.

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Solutions Chapter 4 - Solutions to HWK Problems Ch 4 DQ4-1...

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