The criticality procedure in SAE ARP 5580 is based on a multi-criteria, Pareto ranking system. In this FMEA standard, rank is defined by going through all of the failure modes and finding non-dominated failure modes, which are failure modes that are not outranked in terms of severity and probability of occurrence. The first set of non-dominated failure modes is assigned a rank of 1, then the next level of non-dominated failure modes is assigned a rank of 2, etc.. This procedure continues until all sets of failure modes are ranked. The most critical failure modes are those assigned the highest ranking value.