“The classification of subject matter may be carried out for all sort of special purposes - to arrange books on shelves, to group inventions in patents, to classify the raw materials, intermediates and products of importance to a particular manufacturer, and so on. All such arrangements have their particular uses and their particular problems.”

— Brian Campbell Vickery

Preface to the first edition.
Classification and indexing in science (1958)

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Brian Campbell Vickery 84

British information theorist 1918–2009

Charles Eames (1907–1978) American designer, half of duo the Eames

In answer of the question: What is your definition of Design?
Design Q & A with Charles Eames, 1972

“Every way of classifying a thing is but a way of handling it for some particular purpose.”

William James (1842–1910) American philosopher, psychologist, and pragmatist

1880s, The Sentiment of Rationality (1882)

“Ultimately, discovery and invention are both problems of classification, and classification is fundamentally a problem of finding sameness. When we classify, we seek to group things that have a common structure or exhibit a common behavior.”

Grady Booch (1955) American software engineer

Source: Object-oriented design: With Applications, (1991), p. 133

“The arrangement of the whole work is probably different… from any other… the extent of the subjects… rendered it necessary to preserve a… methodical and uniform system; and it is presumed, that this arrangement will be… of some value, especially in a work calculated to serve as a key, by means of which, access may be obtained to all the widely scattered treasures of science; and which will enable those… desirous of extending their researches in any particular department, to obtain expeditiously all the information that books can afford them.”

Thomas Young (scientist) (1773–1829) English polymath

Preface
A Course of Lectures on Natural Philosophy and the Mechanical Arts (1807)

“Every animal has a particular purpose on the planet. We may not like some of those purposes, but they're all necessary for us to exist.”

Jack Hanna (1947) American zoologist

Source: Jack Hanna Interview: Inside the Mind and Heart of the Animal Kingdom's Best Friend https://smashinginterviews.com/interviews/newsmakers/jack-hanna-interview-inside-the-mind-and-heart-of-the-animal-kingdoms-best-friend (4 May 2014)