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.
making the programmers understand how the system will function.
all of the listed here
giving a demo of the software, to the system manager to whom he reports

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System Analysis and Design
Sequential or series testing is

running the system with line data by the actual user
is checking the logic of one or more programs in the candidate system
testing changes made in an existing or a new program
making sure that the new programs do in fact process certain transactions according to Specifications

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