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.
shows the decision paths
represents the information flow

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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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