All the elements of the process of “becoming informed”... are of interest to investigators other than “information scientists”… The totality of activ… - Brian Campbell Vickery

User needs determine what functions should be provided, and different functions require different structures.

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.

Only in a very static profession can one be trained to slot in immediately to an available job, and our profession is far from static. It is more beneficial for the students to give them a generalised grounding in a wide variety of professional activities and concerns, so that they will have some background knowledge for no matter what job is first available. For those who seek it, our subject also has its cultural value, which can contribute to a general education.