Colon classification (CC) is a library catalogue system developed by Shiyali Ramamrita Ranganathan. It was an early faceted (or analytico-synthetic) classification system. The first edition of colon classification was published in 1933,[1] followed by six more editions. It is especially used in libraries in India.
Its name originates from its use of colons to separate facets into classes. Many other classification schemes, some of which are unrelated, also use colons and other punctuation to perform various functions. Originally, CC used only the colon as a separator, but since the second edition, CC has used four other punctuation symbols to identify each facet type.
In CC, facets describe "personality" (the most specific subject), matter, energy, space, and time (PMEST). These facets are generally associated with every item in a library, and thus form a reasonably universal sorting system.[2]
As an example, the subject "research in the cure of tuberculosis of lungs by x-ray conducted in India in 1950" would be categorized as:
^Raghavan, K. S (December 2015). "The colon classification: a few considerations on its future". Annals of Library and Information Studies. 62: 231–238.
^GOPINATH (M A). Colon classification: Its theory and practice. Library Herald. 26, 1–2; 1987; 1–3.
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