System Analysis and Design
The black-box concept:

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.
assumes that inputs and outputs will remain stable
All of these

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System Analysis and Design
In Decision trees

the branch depends on the condition and decisions to made
All of these
None of these
the root is drawn on the left and is the starting point on the decision sequence.
nodes represent the conditions, with the right side of tree listing the actions to be taken

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