Group skills reflect those activities where it is reasonable or expected that the ability and insight of each member of the party could be used in conjunction, to increase the overall chances of success. For instance, it seems only natural that a group of smart shoppers working in tandem should be able to negotiate better prices in a shop than a single negotiator. Similarly, one strong tactical mind in a group during a fight is a benefit--but two working in tandem should be able to do even better.

Group skill bonuses are calculated on the fly based not just on party membership, but proximity. Party members must be a reasonable distance from one another in order to provide a group skill benefit. This is done so that individuals clear across the map (behind several closed doors, in a completely different part of the neighborhood, etc.) are not credited with offering their insight from a position where their input is unlikely to be of any use.
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