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

all of the listed here
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.

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System Analysis and Design
A couple:

means that the upper module has the capability of calling the lower module
is a data item that moves from one module to another
None of these
is represented by a line joining two modules
None of these

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