Logical Decisions - Classweb

It should be easier for a decision maker to say when she prefers
two alternatives equally (if their differences are easy enough to
understand) than to consistently specify weights.
Another advantage of the tradeoff approach is that the weight
computation method automatically takes the ranges and SUF
curves of the measures into account when LDW computes the
weights. You don't have to consult the decision maker again if
you change the ranges or SUFs for the measures. This idea of
computing the relative importance of the measures using equally
preferred alternatives is discussed further below.
The key element of the tradeoff method is, not surprisingly, a
tradeoff. A tradeoff is a pair of equally preferred simplified
alternatives that differ in their levels on exactly two of the active
members.
9-42 Section 9 -- In Depth