System Analysis and Design
The imitation of a systems investigation may result from:

an analyst's investigation
All of these
a scheduled system's review
a manager's formal request

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System Analysis and Design
System prototyping helps the designer in

giving a demo of the software, to the system manager to whom he reports
making the programmers understand how the system will function.
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
Unit testing is

is checking the logic of one or more programs in the candidate system
testing changes made in an existing or a new program
running the system with line data by the actual user
None of these
making sure that the new programs do in fact process certain transactions according to Specifications

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