The library classification scheme was the first means of subject access to information, but is largely disregarded as a tool for the management of electronic resources ; modern classifications built on facet analytical principles are more appropriate to this purpose than is generally realized. Faceted classifications as exemplified by Bliss Bibliographical Classification (BC2) are powerful tools for the management of vocabulary, characterized by a rigorous analytical approach to terms, and the clear identification of semantic and syntactic relationships and structures. The philosophy and function of BC2 are described, as is the process of building a knowledge structure on facet analytical principles. The range of related functions of such structures when employed as knowledge management tools (as classification, thesaurus, subject heading list, browsable index) is considered, as is the potential of facet analytical knowledge structures for the management of digital materials. Faceted analysis is regarded as a powerful methodology for the creation of structures appropriate to specific retrieval requirements in a range of contexts, with emphasis on the problems of complex subject description and retrieval and multidimensionality.