20. The system of claim 18 , wherein said source identity association module configured to associate the first source identity data and the second source identity data with the particular item comprises: a source identity association module configured to associate with the particular item one or more identities of one or more inference techniques or models used to derive the first inference data and the second inference data.
18. The system of claim 13 , further comprising: a source identity association module configured to associate the first source identity data and the second source identity data with the particular item.