1. A system for processing relationship data sets that express relationship between various entities associated with an enterprise, the system comprising: a) a plurality of data storages for storing a plurality of relationship data sets, each relationship data set expressing a relationship between a plurality of entities; b) a master reference manager for storing master reference data sets, each master reference data set uniquely identifying an entity; c) a hierarchy manager for aggregating relationship data sets for the entities identified by the master reference data sets.