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

all of the listed here
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.

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System Analysis and Design
The approach used in top-down analysis and and design is

None of these
to identify a top level function and then create a hierarchy of lower level modules and components
All of these
to prepare flowcharts after programming has been completed
to identify the top level functions by combining many smaller components into a single entity.

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