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Abstract

Revision of the DDC is based on the growth or recasting of knowledge that is revealed in a decade of publishing. Revision takes place at the Library of Congress and is guided by several professional committees and the advice of experts. 'Decimal Classification Additions, Notes and Decisions (DC&)' conveys revisions of a minor nature between editions. Separate publications, such as for 004-006 Data Processing and Computer Science, make extensive revisions available between editions

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Abstract

It has been generally recognized that the Library of Congress Classification, developed at the turn of the century, has been based an practical rather than theoreti cal or philosophical considerations. Unlike most of the other library classification systems, which originated from individual minds, the Library of Congress Classification system was the result of corporate efforts. Nonetheless, there were a number of individuals who, in the early stages of its development, provided guidance regarding the general framework and direction of the scheme. The most important among these was Charles Martel (1860-1945) who was Chief Classifier at the Library of Congress when the system was first developed. In a paper read before the New Zealand Library Association in April 1911, from which the following excerpt has been taken, Martel gave his views concerning library classification in general and provided a glimpse of the rationale behind the Library of Congress Classification system in particular. In the following excerpt, Martel discusses the basis of the Library of Congress Classification system to be not "the scientific order of subjects ... [but] rather [a] convenient sequence of the various groups ... of books." This is the "literary warrant" an which the Library of Congress system has been based. With regard to the notation, Martel argues for brevity in preference to symmetry or mnemonics. Brevity of notation has since been recognized as one of the greatest advantages of the Library of Congress system as a device for shelf arrangement of books. Martel outlines seven groupings used in the system for subarranging books an the subject, first by form and then by subject subdivisions. This pattern, known as Martel's "seven points," has served as the general framework in individual classes and provided the most significant unifying factor for individual classes in the system, which contain many unique or disparate characteristics.

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Abstract

To those outside the field of library science, the name Melvil Dewey (1851-1931) is virtually synonymous with library classification. To those in the field, Dewey has been recognized as the premier classification maker. His enormously successful system (i.e., successful in terms of the wide adoption of the system around the world for over one hundred years) has now undergone nineteen editions. The Dewey Decimal Classification has been translated into more than twenty languages and is the most widely adopted classification scheme in the world. Even in its earliest manifestations, the Dewey Decimal Classification contained features that anticipated modern classification theory. Among these are the use of mnemonics and the commonly applied standard subdivisions, later called "common isolates" by S. R. Ranganathan (q.v.), which are the mainstays of facet analysis and synthesis. The device of standard subdivisions is an indication of the recognition of common aspects that pervade all subjects. The use of mnemonics, whereby recurring concepts in the scheme are represented by the same notation, for example, geographic concepts and language concepts, eased the transition of the Dewey Decimal Classification from a largely enumerative system to an increasingly faceted one. Another significant feature of the Dewey Decimal Classification is the use of the hierarchical notation based an the arabic numeral system. To a large extent, this feature accounts for the wide use and success of the system in the world across language barriers. With the prospect of increasing online information retrieval, the hierarchical notation will have a significant impact an the effectiveness of the Dewey Decimal Classification as an online retrieval tool. Because the notation is hierarchical, for example, with increasing digits in a number representing narrower subjects and decreasing digits indicating broader subjects, the Dewey Decimal Classification is particularly useful in generic searches for broadening or narrowing search results. In the preface to the second edition of his Decimal Classification Dewey explained the features of his "new" system. The excerpt below presents his ideas and theory concerning the rational basis of his classification, the standard subdivisions, the hierarchical notation based an decimal numbers, the use of mnemonics, the relative index, and relative location. It also reflects Dewey's lifelong interest in simplified spelling.