An electronic documents verification system (and method) detects related contracts, and analyzes contents in the related contracts including a primary contract and associated amendments from raw input data. One embodiment of a disclosed configuration includes a system (and method) for identifying clauses used in the related contracts. The system (and method) extracts features including key references or descriptions within each contract. Additionally, the system (and method) groups the related contracts, and establishes linkages of the related contracts based on the extracted features. Furthermore, the system (and method) analyzes contents in the related contracts based on advanced policy group including a plurality of policy groups.