System Analysis and Design
In top down analyis and design

each succeeding phase is less detailed than the phase before it
each succeeding phase is as detailed as the phase before it.
each succeeding phase is more detailed than the phase before it
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
assumes that the black box is independent
is invoked by describing a system in terms of inputs and outputs, leaving the transformation process a black box.
All of these
None of these

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