The Broad System of Ordering is a subject classification system useful as an aid to subject searching on the Internet or on any large information system covering the whole span of knowledge. As an example of displayed knowledge organisation employing concept indexing and structured according to modern integrative level theory and twentieth century faceted classification principles pioneered by by the Indian mathematician/librarian S.R. Ranganathan, it maps and disentangles the complexity of the relations between the various sectors of knowledge on to a consistent and relatively simple repetitive pattern of of arrangement. For an Internet searcher who has exhausted keyword and hypertext link search methods and needs to search further the Broad System of Ordering (BSO) offers a subject contextual reference framework against which to plot a comprehensive and systematic search strategy. It is particularly useful in clarifying decision-making in searching for subjects which can be named only by phrases rather than single words.

The full BSO schedules can be downloaded from http://www.ucl.ac.uk/fatks/bso.