18. A computer system for determining an impact of text in a document using linguistic analysis, without using statistical methods, and frequency or word pattern based methods, wherein the same text can have different impact for different topics of interest, the system comprising: a processor within the computer system; a cluster generating module configured to generate at least one cluster from a plurality of semantically related clauses across multiple sentences of text of a single document through co-referencing, without statistical methods or frequency or word pattern based methods or any manual review and by applying semantic relationship strength rules based on the type of co-referential relationship in the text; a cluster concept identifier to identify at least one representative concept for the at least one cluster using linguistic rules, wherein the representative concept can be from any sentence in the cluster; wherein other non-representative concepts are not considered for further analysis and where the same representative concept may not be representative in another document; and an impact analyzer including: a semantic parameter identifier configured to determine at least one semantic parameter for a first representative clause of the at least one cluster; at least one configurable linguistic impact analysis rule using parts of speech roles of the words in the clause to determine an impact of the first representative clause of the at least one cluster using the at least one semantic parameter; and an impact engine configured to compute the impact of the first representative clause of the at least one cluster using the representative concept and the at least one configurable linguistic impact analysis rule using parts of speech roles of the words in the clause, on the topic of interest, without statistical methods and without frequency and word patterns, and where the impact can be different for every instance of the clause across different documents or for the same clause for different topics of interest.
21. The system of claim 18 , wherein the impact engine computes an impact of a second representative clause of the at least one cluster with respect to the category of the document and the at least one impact analysis rule using parts of speech roles of the words in the clause, without statistical methods and without frequency and word patterns, such that the first clause and the second clause of the at least one cluster corresponds to at least one sentence of the at least one cluster from a single document.