System Analysis and Design
A data flow diagram is

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

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System Analysis and Design
Rapid prototyping proves the quality of a design by

having a data flow diagram
both (a) and (b)
None of these
having a program simulate the real system
having the system analyst present an overview of the design to users, programmers, and consultants

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System Analysis and Design
The approach used in top-down analysis and design is

to identify the top level functions by combining many smaller components into a single entity
all of the listed here
to prepare flow charts after programming has been completed
to identify a top level function an d then create a hierarchy of lower-level modules and components.

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