13. The process of claim 1 , wherein the process action of forming a weighted keyword candidate-document matrix using the candidate keywords, comprises for each keyword candidate-document pair in the matrix assigning an element weight computed as the product of an importance factor representing a prescribed degree of importance assigned to the keyword candidate of the pair, and a computed frequency factor representing a measure of the frequency that the keyword candidate of the pair appears in the document of the pair.
13. The process of claim 1 , wherein the process action of forming a weighted keyword candidate-document matrix using the candidate keywords, comprises for each keyword candidate-document pair in the matrix assigning an element weight computed as the product of an importance factor representing a prescribed degree of importance assigned to the keyword candidate of the pair, and a computed frequency factor representing a measure of the frequency that the keyword candidate of the pair appears in the document of the pair. 14. The process of claim 13 , wherein computing the frequency factor comprises computing the quotient of the number of times the keyword candidate of the pair appears in the document of the pair, divided by the sum of the number of times each of the candidate keywords appears in the document of the pair.