The only reality to which people have access is the general conceptual schemes by which they give reality a structure. If we take a look at the history of philosophy, there are three names for the discipline called ontology or three names that relate to ontology: metaphysics, first philosophy and, after Glocenius's Lexicon Philosophicum and Lorhardus's Theatrum philosophicum in 1613, ontology. Aristotle gives two accounts of metaphysics: the departmental discipline which identifies first causes, in particular God, and, the universal science whose task it is to examine being qua being. There is no cognitive access available to the independent reality outside his mind. In information science, too, ontology describes the examination of general structural frameworks or conceptualizations and, as in philosophy, those frameworks are of representations. Categorizations in computer science seem to be necessary to deal with specified contents of knowledge so they can be suitably employed in user-defined applications.