Exam 5: Data and Process Modeling

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

In data and process modeling,a(n)_____ shows what the system must do,regardless of how it will be implemented physically.

Diagram 0 (the numeral zero,and not the letter O)provides an overview of all the components that interact to form the overall system.

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.

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

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

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.

Define functional primitives and explain how they are used.

_____ maintains consistency among data flow diagrams (DFDs)by ensuring that input and output data flows align properly.

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.

_____ is the process of drawing a series of increasingly detailed data flow diagrams (DFDs),until all functional primitives are identified.

The symbol for an entity is a circle.

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

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.

In a data flow diagram (DFD),systems analysts call an entity that receives data from the system a source.

The selection structure is the completion of _____.

Using _____,an analyst starts with an overall view,which is a context diagram with a single process symbol,and then creates diagram 0,which shows more detail.

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

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

Spontaneous generation,black holes,and gray holes are impossible logically in a data flow diagram.