System Analysis and Design
System prototyping helps the designer in

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

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System Analysis and Design
Cost-Benefit analysis

compares the cost, with the benefits, of introducing a computer-based system
All of these
estimates the hardware and software costs
None of these
evaluates the tangible and non-tangible factors

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