Division 63 F1

An exposure class shall be given priority to others in the assessment ranking in the decision tree (i.e. it shall be first assessed if an exposure can be assigned to an exposure class, without prejudice to the outcome of that assessment) if otherwise no exposures would potentially be assigned to it. That will be the case where in the absence of prioritisation criteria one exposure class is a subset of others. Therefore, the criteria graphically depicted in the following decision tree would work on a sequential process.