System Analysis and Design
The black-box concept:

None of these
assumes that inputs and outputs will remain stable
All of these
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.

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System Analysis and Design
A Decision table

shows the decision paths
gets an accurate picture of the system
documents rules, that select one or more actions, based on one or more conditions, from a set of possible conditions.
represents the information flow

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