21. The system of claim 18 wherein the returned documents of the search results are ordered in a list and wherein the at least one returned document is displayed in a first portion of the list of returned documents and simultaneously displayed in a second portion of the list of returned documents on a display screen, and wherein the member of returned documents displayed in the second portion is greater than the number of returned documents displayed in the first portion.
18. The system of claim 17 wherein the program module is further operative for: generating a concept vector for each concept data object in the concept set, the concept vector comprising a dimension for each term data object associated with the concept data object, a magnitude of the dimension based on a weight of the association of the term data object with the concept data object; and generating a document vector for the at least one returned document, the document vector comprising a dimension for each of a plurality of terms in the document, a magnitude of the dimension based on a frequency of occurrence of each of the plurality of terms; wherein evaluating the similarity between the at least one returned document and the at least one concept is based on a fuzzy membership score determined by comparing the concept vector to the document vector.