<Li> Hierarchical classification systems are developed classes that are subdivided from the most general subjects to the most specific . </Li> <Li> Faceted classification systems allow for the combination of facets to filter the set of objects rapidly . In addition, the facets can be used to address multiple classification criteria . </Li> <Li> A faceted system focuses on the important, essential or persistent characteristics of content objects, helping it to be useful for categorization of fine - grained rapidly changing repositories . </Li> <Li> In faceted classification systems one does not have to know the name of the category into which an object is placed a priori . A controlled vocabulary is presented with the number of documents matching each vocabulary term . </Li>

Facet analysis in library of congress classification scheme