Program Explanation Leveling of DFDs means drawing a series of detailed diagrams until the system reaches the desired level. An information system contains multiple sub -processes, so it is required to draw a series of DFDs to completely describe that information system. To level the DFDs, the analysts start with an overall view of system with a context diagram. A context diagram provides an abstract view of a system. In the next step, diagram 0 is created which provides more details at lower level and then next lower level is created with more details. In the same way, the DFDs are leveled until all the processes of the information system are identified through the DFDs. For example: Given below are the DFDs created for a grading system...

EBK SYSTEMS ANALYSIS AND DESIGN

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ISBN: 8220102795068

Author: ROSENBLATT

Publisher: CENGAGE L

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Data flow diagram

A visual description of data flow in the system is called a data flow diagram(DFD). DFD is capable of explaining incoming data flow, outgoing data flow, and data storage. The data flow diagram describes how data flows through the system. DFD is developed…

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How would you strike a balance between DFDs?

To what ends would you bring DFDs together?

Think about the three DFDs shown in Figure 6-23. Please enumerate three mistakes or rule infractions that are present on these DFDs.

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EBK SYSTEMS ANALYSIS AND DESIGN

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