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

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.
all of the listed here
a decision should be given a name

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System Analysis and Design
Indexed-Sequential organization

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

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System Analysis and Design
Direct-access organization

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

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