System Analysis and Design
A Decision table

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

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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.
All of these
assumes that inputs and outputs will remain stable
assumes that the black box is independent
None of these

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