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Customers often differentiate their requirements with respect to their relative importance. There are two ways to translate it:
The first way is to set the priority level of the criteria (low, medium, or high): lower priority neighbors are not looked at by the majority of Value Finders as long there are unsatisfied higher priority criteria (well, sort of, see Optimization Engine Advanced Knowledge).
The second way is to set an acceptable delta to targets or thresholds. When the difference between the current value and the target is less than the acceptable delta, the priority of the criteria becomes low.
Priorities only affect value finders when a conflict between criteria arises. Having high and low priorities does not mean the low priorities will be totally ignored.