System Analysis and Design
Indexed-Sequential organization

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

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System Analysis and Design
An audit trial is

None of these
test data used by the system auditor
All of these
designed to permit tracing of any input record or process performed on a system, back toits original sources
post-auditing the system after its implementation

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