25. A method, comprising: receiving one or more signals that define a plurality of categories associated with a set of data objects; receiving a selection of a category from among the plurality of categories, the category being associated with a subset of objects, the subset being included in the set of objects and including at least one object; receiving a selection of a concept from among a plurality of concepts associated with the category; using a processor to perform multi-dimensional analysis on the concept, the multi-dimensional analysis including determining a strength of presence of the concept in the subset; if the concept is absent from the subset, providing an indication of an absence of the concept from the subset; and outputting to a display device a graphical representation of the strength of presence and the category.
25. A method, comprising: receiving one or more signals that define a plurality of categories associated with a set of data objects; receiving a selection of a category from among the plurality of categories, the category being associated with a subset of objects, the subset being included in the set of objects and including at least one object; receiving a selection of a concept from among a plurality of concepts associated with the category; using a processor to perform multi-dimensional analysis on the concept, the multi-dimensional analysis including determining a strength of presence of the concept in the subset; if the concept is absent from the subset, providing an indication of an absence of the concept from the subset; and outputting to a display device a graphical representation of the strength of presence and the category. 27. The method of claim 25 , wherein the first subset is selected by a user, the selection being based on one or more of: a location of the subset on a computer disk drive, a LAN, or a WAN; a location of the subset within a database; a URL address of the subset; a presence of a predefined concept, keyword, or text in the subset; and an absence of a predefined concept, keyword, or text in the subset.