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

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.
standardized language must be used consistently.
a decision should be given a name
all of the listed here

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

to identify a top level function an d then create a hierarchy of lower-level modules and components.
to identify the top level functions by combining many smaller components into a single entity
all of the listed here
to prepare flow charts after programming has been completed

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