System Analysis and Design
System prototyping helps the designer in

making the programmers understand how the system will function.
all of the listed here
communicating to the user, quickly, how the system, when developed, will look like and get a feedback.
giving a demo of the software, to the system manager to whom he reports

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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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