1. A system for processing relationship data sets that express relationships between various entities associated with an enterprise, the system comprising: a master reference manager for (i) receiving a request for data related to a particular entity representing a person or an organization related to the enterprise, and (ii) identifying, based on the request, the particular entity from a master data store that stores master reference data sets representing the most reliable reference data sets maintained in the enterprise for identifying the entities; and a hierarchy manager for providing a comprehensive view of a set of relationships that the particular entity has with one or more other person or organization by (i) retrieving, based on the identification of the particular entity by the master reference manager, relationship data sets that express the set of relationships of the particular entity, and (ii) using the retrieved relationship data sets to generate a display of the comprehensive view of the set of relationships in response to the request.