In scientific information, then, we find that subjects - the themes and topics on which books and articles are written - cluster into fields, each of… - Brian Campbell Vickery

After my first encounter with in the Patent Office, and subsequent use of the (UDC) for the Akers library, I became increasingly interested in problems of information organisation for retrieval. My first paper in the field was "The Structure of a Connective Index" (Vickery, 1950).

The old-established groups in the information profession... have come to recognise that many other social groups are concerned with information transfer.

Systems transfer or transform materials, energy or information - and usually all three. An information system is one whose prime function is to transfer or transform information: the telephone system is an obvious example. This book concentrates on certain types of information system: those concerned with the transfer of information between specialists, mainly with reference to their work, and mainly based on documents. The focus is thus on specialised documentary information systems.