1. A computer implemented method for determining an impact of a document, the method comprising instructions carried out by a processor of the computer for: generating at least one cluster from a plurality of semantically similar clauses of the document; identifying a first concept from a plurality of concepts of the at least one cluster such that the first concept represents at least a portion of content disclosed in the at least one cluster; determining at least one category for the document using the first concept; computing an impact of a first clause of the at least one cluster with respect to the at least one category; and calculating the impact of the document in accordance with the computed impact of the first clause.