Exam 5: Data and Process Modeling

Explain what a data dictionary is, making sure to include definitions of the terms data element and record in your explanation. Provide examples of each of these terms as you include them.

-Many analysts follow a(n) ____________________, which means that they develop a physical model of the current system, a logical model of the current system, a logical model of the new system, and a physical model of the new system.

MATCHING Identify the letter of the choice that best matches the phrase or definition.a.balancing f.data dictionary b.structured analysis g.decision table c.leveling h.logical d.DFD i.data flow e.physical j.record -DFD component that represents one or more data items.

In a DFD, a data flow must have a process symbol on at least one end.

-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.

Balancing ____.

-To draw a context diagram, you start by placing a single process symbol in the center of the page, which you identify as ____________________.

MATCHING Identify the letter of the choice that best matches the phrase or definition.a.balancing f.data dictionary b.structured analysis g.decision table c.leveling h.logical d.DFD i.data flow e.physical j.record -In addition to multiple conditions, this can have more than two possible outcomes.

In a data dictionary, ____ is the maximum number of characters for an alphabetic or character data element or the maximum number of digits and number of decimal positions for a numeric data element.

A DFD does not show the external entities that provide data to the system or receive output from the system.

-The disadvantage of the four-model approach is ____.

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

Using Gane and Sarson symbols, a DFD represents processes as rectangles with rounded corners. _________________________

-Structured English might look familiar to programming students because it resembles ____, which is used in program design.

In a data dictionary, any name other than the standard data element name is called a(n) ____.

In a data dictionary, ____ refers to whether the data element contains numeric, alphabetic, or character values.

-A(n) ____________________ is a data flow in which the same data travels to two or more different locations.

The data dictionary usually records and describes a default value, which is the ____.

In a data dictionary, data elements are combined into ____, which are meaningful combinations of data elements that are included in data flows or retained in data stores.

-____ is based on combinations of the three logical structures, or control structures (one of which is shown in the accompanying figure), which serve as building blocks for the process.