System Analysis and Design
The black-box concept:

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

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System Analysis and Design
A system analyst designs a new system by

identifying sub systems and the interfaces between sub systems
adopting a developed system to the present environment
propose alternatives to the current system
developing the system as a large, single unit
None of these

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