Exam 7: Using Data Flow Diagrams

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Base elements are elements that need to be keyed into the system.

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Partitioning on a data flow diagram for an ecommerce Web site may be used to show:

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A rectangle with rounded corners is used to show the occurrence of a transforming process.

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A transaction file links two processes that execute at different times.

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The highest level data flow diagram is called Diagram 0.

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Each external entity is labeled with a noun.

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Transaction files:

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While the first ________ diagram helps the systems analyst grasp basic data movement, its general nature limits its usefulness.

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Each time an external company or system is involved:

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Processes in a rectangle with rounded corners sometimes denote something other than a change in or transformation of data or a system/subsystem.

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A basic process is one that does not explode to a child diagram.

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A logical data flow diagram focuses on how the business operates.

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What are the four advantages of using a data flow approach over narrative explanations of data movement?

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A use case summarizes an event and defines one activity.

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What should be created each time data must be obtained from an external partner?

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