[Information] science and technology are now so closely linked that analysis and experiment lead quickly on to invention, to the introduction of new … - Brian Campbell Vickery

The basic rules of classification are - Each characteristic of division must produce at least two classes - Only one principle of division must be used at a time, to produce mutually exclusive classes. - The species of any genius must be completely exhaustive of their parent class.

# The way in which units of information, and relevant relations between them, are defined in the system. This is the semantic level of subject analysis.

I met Ranga on several occasions. He was a fascinating personality, highly organised, a tireless worker, a fierce enthusiast, a charming man. Speaking of his passion for work, he told me once how his young son had stuck a notice on his study door: “Librarianship is unfair to families”... It really was a privilege to have known him.