System Analysis and Design
The processes at the most detailed level of the data flow diagrams are called

functional primitives
data flows
interfaces
transform descriptions
None of these

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System Analysis and Design
The black-box concept:

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

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