15. Normally a data flow diagram (DFD) is used for internal diagnosis of problems and doesnt depict external sources that provide data into the system or receive output from the system.

a. True

b. False

16. System developers and analysts show DFDs that label entities that receive data from the system as sources.

a. True

b. False

17. A system become more complicated than others depending on increased in the number of components, the number of levels, and the amount of interaction among its processes, entities, data stores, and data flows.

a. True

b. False

18. With regard to functional primitives, deciding whether a process is one or whether it can be further divided is a matter of experience and judgment often depends upon the programmers who must translate the logical design into code.

a. True

b. False

19. A data store is commonly depicted in a DFD with significant details about it contents.

a. True b. False

20. When creating a model a(n) _____ shows what the developed system must do, no matter how it will be developed physically.

a. organizational model

b. physical model

c. logical model

d. relational model

21. The purpose of a data flow diagram (DFD) is to show _____.

a. how data are related

b. what key fields are stored in the system

c. how a system transforms input data into useful information

d. what data is stored in the system

22. In a ____________ the inputs, outputs and other functions of a process are known but the actual internal operations are not shown or known.

a. black box

b. terminator

c. business rule

d. decision table

23. A central storehouse of information about a systems data is typically called a_________.

a. data cube

b. data feed

c. data mart

d. data repository

24.When you create a new name for a data element in a data dictionary other than the standard name, its called a(n) ___________.

a. clone b. cipher c. alias d. script

25. In a data dictionary, typically some data elements have _____ rules. Examples might include an employees salary within the range defined for the employees job classification. a. domain

b. range

c. validity

d. mastered