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

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

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System Analysis and Design
The black-box concept:

assumes that inputs and outputs will remain stable
All of these
assumes that the black box is independent
None of these
is invoked by describing a system in terms of inputs and outputs, leaving the transformation process a black box.

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