4. The system of claim 3 wherein said means for quantifying the strength of relationship between said phrases and each pervasive theme area, comprises: a means for producing numerical indices and figures of merit from said database; and a means for applying said numerical indices and figures of merit to quantify the strength of relationship of each said phrase and each pervasive theme area.
4. The system of claim 3 wherein said means for quantifying the strength of relationship between said phrases and each pervasive theme area, comprises: a means for producing numerical indices and figures of merit from said database; and a means for applying said numerical indices and figures of merit to quantify the strength of relationship of each said phrase and each pervasive theme area. 5. The system of claim 4 wherein said means for producing numerical indices and figures of merit employs definitions for numerical indices selected from the group consisting of absolute frequency of occurrence, denominated C.sub.j, of the pervasive theme area, absolute frequency of occurrence of the extracted phrases C.sub.i for single, adjacent double, adjacent triple . . . adjacent nth, and C.sub.ij the frequency of occurrence of the extracted phrases (single, adjacent double, adjacent triple, . . . adjacent mth) within a set range of single words of the pervasive theme area.