The pairs weighting option presents criteria two at time to set their relative importance, an easy way to develop a set of weights -- especially in a meeting. Once DecisionPad has enough pairs it can assemble the complete weight set for review and fine tuning.
Pairs can also be used for subjective ratings between alternatives within a criterion.
In DecisionPad, paired settings are one of several options for setting weights and ratings, unlike programs where paired settings are the only method. Each of the DecisionPad methods has its fans and uses; it's your choice.