Taxonomy is the organization of a particular set of information for a particular purpose. It comes from biology, where it's used to define the single location for a species within a complex hierarchic. Biologists have arguments about where various species belong, although DNA analysis can resolve most of the questions. In informational taxonomies, items can fit into several taxonomic categories.

Categorization is the process of associating a document with one or more subject categories. So the entry for a page on cross trainer shoes could go into Running, Manufacturing, Sports Medicine, or Rushkoff, Douglas! All of these are legitimate, depending on the context.

Cataloging and Classification come from libraries, where specialists enter the metadata (such as author, date, title and edition) for a document, apply subject categories to it, and place it into a class (such as a call number) for later retrieval. These tend to be used interchangeably with Categorization.

Clustering is the process of grouping documents based on similarity of words, or the concepts in the documents as interpreted by an analytical engine. These engines use complex algorithms including Natural Language Processing, Latent Semantic Analysis, Bayesian statistical analysis, and so on.

A Thesaurus is a set of related terms describing a set of documents. This is not hierarchical: it describes the standard terms for concepts in a controlled vocabulary. Thesauri include synonyms and more complex relationships, such as broader or narrower terms, related terms and other forms of words.

Ontology is the study of the categories of things within a domain. It comes from philosophy and provides a logical framework for academic research on knowledge representation. Work on ontologies involves schema and diagrams for showing relationships in Venn diagrams, trees, and lattices and so on.

A Directory is an organized set of links, like those on Yahoo or the Open Directory Project, which allows a web site to display the scope and focus of its content. A directory can cover a single host, a large multi-server site, an intranet or the Web. At each level, the category names provide instant context information to users. Rather than a simple list, such as the results of a search, drilling down into the more and more specific categories (for example Shopping > Clothing > Footwear > Athletic) explains how the pages fit into the larger set of information

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