Chapter 5 Flashcards
The disadvantage of the four-model approach is that ____.
additional time and money are required to develop a logical and physical model of the current system
Decision trees show the logic structure in a _____.
horizontal form that resembles a tree with the roots at the left and the branches to the right
In a data dictionary, _____ refers to whether the data element contains numeric, alphabetic, or character values.
type
_____ maintains consistency among data flow diagrams (DFDs) by ensuring that input and output data flows align properly.
Balancing
The major benefit of _____ is that it gives a clear picture of current system functions before any modifications or improvements are made.
the four-model approach
The analysts at Techno InfoSystems are considering the four-model approach to system development for a new client.
If they make use of the four-model approach, which is a likely outcome?
The time required to develop the model will increase.
A _____ shows a logical structure, with all possible combinations of conditions and resulting actions.
decision table
Processes contain the business logic, also called business rules, which transforms the data and produces the required results.
True
Data flow diagram entities also are called terminators because they are data origins or final destinations.
True
Data stores are shown in a context diagram because data stores are external to the system.
False
The end product of data and process modeling is a logical model that will support business operations and meet user needs.
True
A diverging data flow is a data flow in which the same data travels to two or more different locations.
True
When a context diagram is expanded into data flow diagram (DFD) diagram 0, all the connections that flow into and out of process 0 must be retained.
True
When a data flow diagram (DFD) is exploded, the lower-level diagram is referred to as the parent diagram.
False
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.
False
