According to the criterion, either DeltaUMin or DeltaUMax is set e.g MinSizeCrtierion sets DeltaUMin when MaxSizeCriterion sets DeltaUMax. The implicit rule is that DeltaUMin is predominant over DeltaUMax i.e.: UpdateWithUMaxValue: DeltaUMax = Max(DeltaUMin, Min(DeltaUMax, NewDeltaUMax))