| Title | Dewey Decimal | Library of Congress | |
|---|---|---|---|
| COMPARE: | The Declaration of Independence | 973.3 Uni | |
| The Declaration of Independence and the Constitution | JK146 .L35 1956 | ||
| COMPARE: | Quasars, Pulsars, and Black Holes | 523.8 Asi | |
| Quasars and Pulsars | QB860 .L37 |
Let's illustrate how a DDC call number works using the following book from the Oversize Juvenile Nonfiction collection:
| 973.3 | The Declaration of Independence |
| Uni | by the United States of America |
COMPARISON OF DDC AND LCC
The two systems were developed around the same time, give or take a decade or so. Both were based on the perception of knowledge and the relationships between academic disciplines extant from 1890 to 1910. Both are enumerative systems covering all topics, all disciplines, all fields of knowledge. Both are updated regularly. Both use a "controlled vocabulary," that is, a list of preferred terms for cataloging.
Intner and Weihns say that both systems reflect the bias of a nineteenth-century U.S. outlook, then a "Western" outlook, and reflect a "white, male, Anglo-Saxon Christian view of the universe." These biases are more obvious in the LCC, and have been largely eliminated in the UDC variant of the DDC.
The differences are more striking.
Size: The LCC is significantly larger--that is, LCC has more broad classes (21 vs. 10), with more and narrower subcategories.
Specificity: The LCC has far more specific subclasses and categories that tend to be technical in nature. In any classification system, from libraries to file drawers, the question is: do you have a lot of files with less material in each one, or fewer files with more material in each one? LCC opts for the former approach; DDC for the latter. (Note that there is still order in the DDC within each file, of course.)
Structure: The DDC has overarching principles (for instance, decimal division) and mnemonic notations. For the LCC, each of the 21 classes was developed independently by experts in that field, and continues to be expanded and updated independently. There is no consistency in LCC between the classes.
Notation: The DDC uses only numbers; combined with some mnemonics, it's much easier for librarians, students, volunteers, and so on to remember. The LCC, in contrast, uses both letters and numbers, allowing more classes, more categories, more classifications.
Indexing: The DDC Relative Index can bring all topics together, under one grand umbrella, regardless of what class they're in. This is lacking in the LCC, because of the inconsistency between classes.
In sum, DDC uses fewer categories and sub-classifications and is consistent across disciplines, while LCC is more highly subdivided with no consistency between disciplines. It's understandable, therefore, that DDC has proven more useful to libraries catering to a wide range of needs such as public libraries and schools, while LCC is more widely used in libraries focused more on technical areas like colleges, universities, and government.
Resource :
http://www.straightdope.com/columns/read/2238/whats-so-great-about-the-dewey-decimal-system
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