The scope of a specialised documentary classification is usually designated by its title, the subject field that it professes to classify. It is no e… - Brian Campbell Vickery

I suspect that teaching the history of our subject is less frequent in our institutions than it was. We are getting short-sighted both in looking forward and in looking backward, to our detriment.

A retrieval system can be studied at three levels:

The development of information research has increased considerably the interaction of emerging information science with other disciplines. Librarianship has traditionally had links with education and classification and has drawn ideas from logic and philosophy. But during the last fifty years new insights and methods have been derived from sociology and social psychology, from computer science, from operations research and related quantitative approaches, from communications research, from linguistics, and most recently from the new hybrids: cognitive science and artificial intelligence.