Exam 5: Data and Process Modeling

In a data flow diagram (DFD),a gray hole is a process that has _____.

What type of relationships exist among the items in a data dictionary?

Processes are generally very simple.

_____ is based on combinations of the three logical structures,or control structures,which serve as building blocks for the process.

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.

In DFDs,a process symbol can be referred to as a white hole,because the inputs,outputs,and general functions of the process are hidden,but the underlying details and logic are known.

In a data dictionary,some data elements have _____ rules.For example,an employee's salary must be within the range defined for the employee's job classification.

If they make use of the four-model approach,which is a likely outcome?

Deciding whether to explode a process further or determine that it is a functional primitive is a matter of experience,judgment,and interaction with programmers who must translate the logical design into code.

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

A data flow diagram (DFD)shows _____.

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.

What guidelines should you follow when you draw a context diagram and other data flow diagrams (DFDs)?

The selection structure is the completion of _____.

A _____ shows how data moves through an information system but does not show program logic or processing steps.

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

-Among the symbols in the accompanying figure,a _____ is used to represent data that a system stores because one or more processes need to use the data at a later time.

Processes contain the business logic,also called business rules,which transforms the data and produces the required results.

In a data flow diagram (DFD),a process symbol can have only one outgoing data flow.

When drawing a context diagram,standardized names should be used within each set of symbols.