System Analysis and Design
The black box concept is based on the assumption(s) that;

black boxes are dependent or environments
the suprasystem is stable
None of these
the relationship between the inputs and output is stable
All of these

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System Analysis and Design
The rule(s) to follow in constructing decision tables is (are):

a decision should be given a name
standardized language must be used consistently.
the logic of the table is independent of the sequence in which conditions rules are written, but the action takes place in the order is which the events occur.
all of the listed here

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