Page 263 - DLIS002_KNOWLEDGE ORGANIZATION CLASSIFICATION AND CATALOGUING THEORY

Knowledge Organization: Classification and Cataloguing Theory

Notes 134: Canon of Ascertainability
Each characteristic should be definitely ascertainable.
135: Canon of Permanence
Each characteristic should continue to be both ascertainable and unchanged, so long as there is
no change in the purpose of the classification.
136: Canon of Relevant Sequence
The characteristics of the scheme are to be used in a sequence relevant to the purpose of the
classification.
137: Canon of Consistency
The sequence of applying the chosen characteristics should be consistently adhered to.

14.4.2 Canons for Array

141: Canon of Exhaustiveness
The classes in any array of classes should be totally exhaustive of their common immediate
universe.

142: Canon of Exclusiveness
The classes in an array of classes should be mutually exclusive.
143: Canon of Helpful Sequence

The sequence of the classes in any array should be helpful. It should be according to some
convenient principle, and not arbitrary, wherever insistence on one principle does not violate
other more important requirements.
144: Canon of Consistent Sequence
Whenever similar classes occur in different arrays, their sequences should be parallel in all such
arrays, wherever insistence on such a parallel does not run counter to other more important
requirements.

14.4.3 Canons for Chain

151: Canon of Decreasing Extension
While moving down a chain from its first link to its last link, the intension of the classes should
increase, and the extension of the classes should decrease.

152: Canon of Modulation
A chain of classes should comprise one class of each and every order that lies between the orders
of the first link and the last link of the chain.

14.4.4 Canons for Filiatory Sequence

161: Canon for Subordinate Clauses

All the subordinate classes of a class, in whatever chain they may occur, should immediately
follow it, without being separated from it or among themselves by any other class.

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