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

All of these
to identify a top level function and then create a hierarchy of lower level modules and components
to identify the top level functions by combining many smaller components into a single entity.
to prepare flowcharts after programming has been completed
None of these

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

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

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