Despite the fact that our profession constantly urges others to “consult the literature”, I do not think we are distinguished nowadays by knowledge o… - Brian Campbell Vickery

There is as yet no unified theory of retrieval systems, and a good deal of retrieval practice is still an empirical art, unsullied by theory.

The analogy with bibliographic classifications and thesauri is obvious... despite the differences, it is to be regretted that 'ontological engineers' make little or no reference to work in information science. As a consequence, they do not appear to draw at all on the rich experience of constructing knowledge schedules … or... developing concept lexicons.

Information practice... consists of two activities that we may call diagnosis and prevention. Diagnosis is identifying what is the most probable information need of a user in a particular state of information want. Provision is deciding what action is most likely to meet that need. Information science seeks to understand the potential range of user situations giving rise to information want and needs; to develop methods of identifying the actual information needed; to understand and expand the range of possible ways of satisfying information need; and to develop methods of deciding what way is most likely to be effective in a particular case.