System Analysis and Design
In top down analyis and design

each succeeding phase is less detailed than the phase before it
all of the listed here
each succeeding phase is more detailed than the phase before it
each succeeding phase is as detailed as the phase before it.

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System Analysis and Design
The black-box concept:

assumes that the black box is independent
assumes that inputs and outputs will remain stable
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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System Analysis and Design
Cost-Benefit analysis

None of these
evaluates the tangible and non-tangible factors
estimates the hardware and software costs
All of these
compares the cost, with the benefits, of introducing a computer-based system

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