The grades are based on the number of nonconformances identified during the audit e.g. grade (no non-conformances), grade 2 (some observations), grade 3 (minor non-conformances), grade 4 (1-3 major non-conformances), grade 5 (4 or more major nonconformances or 1-3 critical non-conformances), business critical grade (business critical nonconformances or 4 or more critical non-conformances).