All information services are ultimately based on library methods and materials. - Douglas John Foskett

consists in an analysis of a subject in its entirety into a certain number of facets or categories of things; within each category, the subject headings enumerated all possess the same relationship vis-&-vis the subject in its entirety.

Information retrieval consists of four main stages: Identifying the exact subject of the search; Locating this subject in a guide which refers the searcher to one or more documents; Locating the documents; Locating the required information in the documents.

During... ten years the C.R.G. has met nearly every month, and although it has never had more than about a dozen active members, its influence has grown to the point at which is causes Mortimer Taube in America to rage over its medieval scholasticism, John Metcalfe in Australia to denounce it as a plot by Ranganathan to ruin librarianship, and a British University librarian to describe it as one of the two most significant developments in British librarianship since the end of the war.