23. The system of claim 22 , wherein the impact engine determines the impact of the at least one cluster using the impact of the at least one sentence from the same document without regard to statistical methods or frequency or word patterns.
22. The system of claim 21 , wherein the impact engine determines an impact of at least one sentence from the impacts of the first representative clause and the second representative clause of the at least one cluster of semantically related sentences from a single document, using configurable impact analysis rules which can be based on a conjunctive relationship between the clauses and specify clause level weights for aggregation; where the conjunctive relationships between the clauses of the same sentence can cause the impact of the at least one sentence to increase or decrease; wherein the first and second clause can be from different sentences of the at least one cluster of semantically related sentences from the same document.