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

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

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System Analysis and Design
In top down analyis and design

each succeeding phase is less detailed than the phase before it
all of the listed here
each succeeding phase is more detailed than the phase before it
each succeeding phase is as detailed as the phase before it.

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System Analysis and Design
Indexed-Sequential organization

has records placed randomly throughout the file
means storing records in contiguous blocks according to a key
stores records sequentially but uses an index to locate records
uses an index for each key type

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