System Analysis and Design
In top down analyis and design

each succeeding phase is as detailed as the phase before it.
all of the listed here
each succeeding phase is less detailed than the phase before it
each succeeding phase is more detailed than the phase before it

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System Analysis and Design
System prototyping helps the designer in

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
all of the listed here
making the programmers understand how the system will function.

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