Audit trails and test records have different values to different people at different points. Aside from the obvious value of an audit trail in a litigious society, the record of what was tested and when can assist with a quarterly rotation of testing - ending the need to place small coloured stickers on detectors to denote who did what last and when.
In the particular case of ASD systems, recording the transport time from one test to the next and comparing it with commissiong data and acceptable deviation parameters can assist judgements over pipe and system integrity and reliability.
