System Analysis and Design
A Decision table

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
shows the decision paths

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

standardized language must be used consistently.
a decision should be given a name
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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