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

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.
all of the listed here
standardized language must be used consistently.

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System Analysis and Design
Sequential organization

Stores records sequentially but uses an index to locate records
uses an index for each key type
means storing records in contiguous blocks according to a key.
None of these
has records placed randomly throughout the file

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System Analysis and Design
Direct-access organization

has records placed randomly throughout the file
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.

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