1. A record of both completed and attempted accesses and service. 2. Data in the form of a logical path linking a sequence of events, used to trace the transactions that have affected the contents of a record. 3. A chronological record of system activities to enable the reconstruction and examination of the sequence of events and/or changes in an event. Note: Audit trail may apply to information in an information system (IS,) to message routing in a communications system, or to the transfer of COMSEC material. 4. The set of records generated by a system in response to accounting operations, providing the basis for audit. 5. See Security Audit Trail. 6. The destination of audit records that are recorded, and the source of records read by an audit post-processing application. 7. A set of records that collectively provide documentary evidence of processing used to aid in tracing from original transactions forward to related records and reports, and/or backwards from records and reports to their component source transactions.