System Analysis and Design
System prototyping helps the designer in

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
making the programmers understand how the system will function.

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System Analysis and Design
A system analyst designs a new system by

adopting a developed system to the present environment
identifying sub systems and the interfaces between sub systems
developing the system as a large, single unit
None of these
propose alternatives to the current system

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