System Analysis and Design
A data flow diagram is

None of these
the modern version of flowchart
All of these
mainly used at the systems specification stage.
the primary output of the systems design phase

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System Analysis and Design
Data Definition Language (DDL)

describes how data are structured in the data base
determine how data must be structured to produce the user's view
specifies for the DBMS what is required; the techniques used to process data
all of the listed here

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System Analysis and Design
A couple:

is a data item that moves from one module to another
is represented by a line joining two modules
None of these
None of these
means that the upper module has the capability of calling the lower module

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