Exam 5: Data and Process Modeling

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Data stores are shown in a context diagram because data stores are external to the system.

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MATCHING Identify the letter of the choice that best matches the phrase or definition. -DFD component that represents one or more data items.

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____ is/are logically impossible in a DFD because a process must act on input, shown by an incoming data flow, and produce output, represented by an outgoing data flow.

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DFDs are balanced if each internal process is numbered to show that it is a child of the parent process.

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By showing processes as ____________________, an analyst can create DFDs that show how the system functions, but avoid unnecessary detail and clutter.

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Leveling ____.

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Leveling also is called ____.

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A DFD shows ____.

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The first step in constructing a set of DFDs is to draw a(n) ____________________, which is a top-level view of an information system that shows the system's boundaries and scope.

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Analysts use ____________________ modeling techniques to show how a system transforms data into useful information.

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A data ____ is a central storehouse of information about a system's data.

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In a data dictionary, a(n) ____ is the smallest piece of data that has meaning within an information system.

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What makes one system more complex than another is the number of components, the number of levels, and the degree of interaction among its processes, entities, data stores, and data flows.

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When a set of DFDs is created for a system, a(n) ____________________ is a process that consists of a single function that is not exploded further.

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A gray hole process is a process that has ____.

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What are the guidelines to follow when you draw a context diagram and other DFDs?

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A decision ____ is a graphical representation of the conditions, actions, and rules found in a decision table.

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  -Among the symbols in the accompanying figure, a(n) ____________________ is a path for data to move from one part of the information system to another. -Among the symbols in the accompanying figure, a(n) ____________________ is a path for data to move from one part of the information system to another.

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A data dictionary specifies a data element's ____, which is the set of values permitted for the data element.

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In a DFD, the Gane and Sarson symbol for a data store is a ____.

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