System Analysis and Design
To reconstruct a system, which of the following key element(s) must be considered :

control and processors.
feedback and environment
outputs and inputs
all of the listed here

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System Analysis and Design
Positive testing is

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

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