System Analysis and Design
Management's decision to rent a computer system may be based upon

tax advantages
desire to avoid a large one-time payment
all of the listed here
operational flexibility in changing hardware

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System Analysis and Design
Positive testing is

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

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