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 headi… - Douglas John Foskett

The purpose of a classification scheme is to arrange information, in documents on shelves or on cards in indexes, in a sequence that will be helpful to the user.

The CRG turned its thoughts towards a much more complex matter that had received little attention from any of the other schools of thought which had been represented at the two Conferences [Dorking and ICSI]. This is the relation between general and special classifications: is there anything to be gained by pursuing the ideal of a new universal classification scheme, and if so, how will the specialist's need be served by it? How can the CRG schemes, for example, that prove so satisfactory for their users, be integrated into such a general scheme?

The retrieval process begins when a lack of information shows itself in a human mind and the decision is taken to find out if this information has been discovered and published