System Analysis and Design
The black-box concept:

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
assumes that inputs and outputs will remain stable
None of these

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System Analysis and Design
In a Decision tree

the nodes represent the conditions, with the right wise of tree listing the actions to be taken
all of the listed here
the branch, to be followed, depends on the conditions and decisions, to be made
the root is drawn on the left and is the starting point on the decision sequence

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