Division 2.1.2 Barrier effectiveness

The effectiveness of each barrier shall be classified as follows:

• ‘Stopped’ if the barrier prevented the accident from occurring;

• ‘Remaining Known’: if it is known whether the barrier remained between the occurrence under assessment and the potential accident outcome;

• ‘Remaining Assumed’: if it is assumed that the barrier remained between the occurrence under assessment and the potential accident outcome;

• ‘Failed Known’: if it is known that the barrier has failed;

• ‘Failed Assumed’: if it is assumed that the barrier have failed even if insufficient or no information is available to determine this;

• ‘Not Applicable’: if the barrier is not relevant to the occurrence under assessment.