Library Classification

Library Classification: Classification means putting together the like-entities and separating the unlike entities. The characteristics of entities are used as a basis for determining the likeness and unlikeness between them. A class consists of entities which are like in some respects and possessing certain qualities in common. This helps in distinguish them from another class of entities.

1. Definition: A library classification is a system of coding and organizing library materials (books, serials, audiovisual, computer files, maps, photographs, manuscripts, regalia, gramophone records, tape records, microfilm and so on) according to their subject. It provides formal access to documents in a library.

Sayers defines library classification as “the arrangement of books on shelves or description of them in the manner which is most helpful to those who read”. The emphasis is on usefulness so that the users can locate the document without complication.

According to Margaret Mann, classification is “the arranging of things according to likeness and unlikeness. It is the sorting and grouping of things, but in addition classification of books is a knowledge classification with adjustment made necessary by the physical forms of books.”

According to S.R. Ranganathan, “it is the translation of the name of the subject of a book into a preferred artificial language of ordinal numbers and the individualization of the several books dealing with the same specific subject by means of a further set of ordinal numbers which represents some features of the book other than their thought content”. The first of these ordinal numbers is called the class number of the book. The second ordinal numbers is called its book number. The class number and the book number together constitute the call number of the book.

The library classification system provides a system for organizing the knowledge embodied in books, CD, web, etc. It supplies a notation (in case of DDC, it is Arabic numerals) to the document. The Dewey Decimal Classification (DDC) system is a general knowledge organization tool that is continuously revised to keep pace with the development of knowledge. It is the most widely used classification scheme in the world. Libraries in more than 135 countries use the DDC to organize their collection. It is also used over the web for organizing the web resources for the purpose of browsing.

2. Need: Until 19th century, most libraries had closed stacks, so the library classification only served to organize the subject catalogue. In the 20th century, libraries opened their stacks to the public and started to shelve the library material itself according to certain library classification scheme to simplify subject browsing. So classification is needed for providing the following advantages

i) Helpful Sequence: Classification brings the like documents together on the shelf in a helpful sequence providing approach through subject.

ii) Locate a Particular Document: A library collects / preserves documents. It is very difficult to locate a required document from a system of disorderly collection. So, it needs classification to bring order to the collection.

iii) Self Help: Classification helps the locating of document by the patron of the library itself, thus requiring less assistance from the library staff.

iv) Correct Replacement: Documents would be taken out from shelves by the users or library staff. The classification helps in the correct replacement of documents after these have been returned from use.

v) Mechanical Arrangement: The classification helps the mechanization of the collection by allocating notation.

3. Different Schemes of Classification: To derive the particular class number different libraries use different classification schemes. All classification schemes can be categorized into three kinds- based on the language, based on the synthesis and based on arrangement. Let us discuss them in detail

Based on the language library classification can be:

i) English-Speaking World: In the English –speaking countries Dewey Decimal Classification (DDC), Library of Congress Classification (LC), Bliss Bibliographic Classification (BC), Dickinson Classification are generally followed.

ii) Non English Speaking World: Non English speaking countries use Nippon Decimal Classification (NDC), Principes de Classement des Documents Musicaux (PCDM), Chinese Library Classification (CLC), Korean Decimal Classification (KDC), etc.

Synthesis means combining codes from different lists to represent the different attributes of a work. Based on synthesis library classification may be Bibliographic Classification by Bliss, Colon Classification by Ranganathan, Expansive Classification by Cutter, Universal Decimal Classification, etc.

Based on the arrangement there are three main types of classification systems:

i) Enumerative: Produce an alphabetical list of subject headings; assign numbers to each heading in alphabetical order. The most common classification systems, LC and DDC, are essentially enumerative, though with some hierarchical and faceted elements, especially at the broadest and most general level.

ii) Hierarchical: Divides subjects hierarchically, from general to specific.

iii) Faceted or analytico-synthetic: Divides subjects into mutually exclusive orthogonal facets. The first true faceted system was the Colon classification of S. R. Ranganathan.

iv) Specialist Classification: Specialist classification systems have been developed for particular subject areas, and some specialist libraries develop their own classification system that emphasizes those areas they specialize in. An example is the Medical Subject Headings devised by the US National Library of Medicine (NLM). Another example is the specialist classification system for art and iconography (Iconclass). There are also emerging metadata standards that are being developed for web resources, digital images, and other specialized materials.

4. Dewey Decimal Classification: The Dewey Decimal Classification (DDC) system is the world’s most widely used library classification system. American librarian and library educator Melville Dewey devised the system in 1873 while he was a student at Amherst College in Massachusetts. The Dewey Decimal system was first published in 1876 as “A Classification and Subject Index for Cataloguing and Arranging the Books and Pamphlets of a Library”. It appeared in the form of a small book of 44 pages. The Decimal Classification Editorial Policy Committee (EPC) was established in 1937 to serve as an advisory body to the Dewey Decimal Classification. In 1988, Online Computer Library Center, Inc (OCLC) acquired the DDC. The editorial headquarters was located at the Library of Congress in the Decimal Classification Division. The editors prepare the proposed schedule revisions and expansions, and forward the proposals to EPC for review and recommended action. Nowadays, DDC is published by Online Computer Library Center, Inc in full and abridged editions. The abridged edition targets the general libraries having less than 20,000 titles. Both the full and abridged editions are available in print as well as in electronic version.

4.1 Introduction to 22nd Edition of DDC: The edition 22 is the first edition of the DDC, which is produced in the context of the web environment. DDC 22 is composed of the following major parts in four volumes.

a) Volume 1: It includes special features of edition 22, introduction regarding how to use the DDC, glossary, index to the introduction and glossary, a manual (guide to the use of the DDC), and six numbered tables. It also has the lists that compare editions 21 and 22 with the list of relocated, discontinued and reused numbers.

b) Volume 2: It includes DDC summaries (the top three levels of the DDC), and schedules (from 000-599). The summaries will help you to visualize at a glance the structure and scope of various subjects as laid down in DDC.

The first summary contains ten main classes. The first digit in each three-digit number represents the main class. For example, 600 represents technology.

The second summary contains the hundred divisions, ten for each main class. The second digit in each three-digit number indicates the division. For example, 600 is used for general works on technology, 610 for medicine and health, 620 for engineering, 630 for agriculture.

The third summary contains the thousand sections. The third digit in each three-digit number indicates the section. Thus, 610 is used for general works on medicine and health, 611 for human anatomy, 612 for human physiology, 613 for personal health and safety.

c) Volume 3: It includes the organization of knowledge schedules from 600-999.

d) Volume 4: It includes a relative index. The relative index (it relates subjects to discipline) contains an alphabetical list of subjects with the disciplines in which they are treated as sub-arranged alphabetically under each entry.

4.2 Understanding the Structure of DDC: The Dewey Decimal Classification (DDC) system uses simple decimal notation to divide recorded knowledge into 10 main classes at the broadest level which together cover the entire world of knowledge. Each main class is further divided into ten divisions, and each division into ten sections giving 100 divisions and 1,000 sections. All the numbers for the divisions and sections have not been used.

a) Tables: The six tables in the DDC are as following

T1        Standard Subdivisions

T2        Geographic Areas, Historical Periods, Persons

T3        Subdivisions for the Arts, for Individual Literatures, for Specific Literary Forms

T4        Subdivisions of Individual Languages and Language Families

T5        Ethnic and National Groups

T6        Languages

The notation from T1can be added to any numbers unless there is an instruction in the schedules or tables to the contrary. The other table notations may be added only when instructions are given in the schedules or tables.

b) Summaries: The Dewey Decimal Classification divides human knowledge into ten basic categories, with subdivisions indicated by decimal notation. Each of the ten main classes has the potential to be broken down into smaller multiples of ten. The word decimal in the name of the classification system comes from decem, the Latin word for “ten”.

DDC has three summaries. The first summaries includes 10 main classes, the second summary includes 100  divisions and the third summary includes 1000 sections.

i) First Summary: The ten primary classes of DDC are as follows:

000 Generalities

100 Philosophy and psychology

200 Religion

300 Social sciences

400 Language

500 Natural sciences and mathematics

600 Technology (applied sciences)

700 The arts; fine and decorative arts

800 Literature and rhetoric

900 Geography and history

            A brief explanation of each of the class is given below.

000: Class 000 is the most general class. It includes the works that are not limited to any one specific discipline or the works that are related to information and knowledge. It includes encyclopedias, newspapers, general periodicals, computer science, library and information science, journalism, etc.

100: Class 100 covers Philosophy, Parapsychology and occultism, and Psychology.

200: Class 200 is devoted to Religion.

300: Class 300 covers the social sciences that include Sociology, Anthropology, Statistics, Political science, Economics, Law, Public administration, Social problems and services, Education, Commerce, Communications, Transportation, Custom (including folk literature), etc.

400: It comprises languages, linguistics, and specific languages.

500: It includes Natural sciences and Mathematics.

600: Class 600 includes technology.

700: It covers arts in general, fine and decorative arts, music, and the performing arts. It also includes recreation, including sports and games.

800: It covers literature, and includes rhetoric, prose, poetry, drama, etc.

900: It is devoted to History and Geography.

ii) Second Summary: Again, each of the 10 Main Classes is subdivided into 10 Divisions resulting in 100 Divisions on the whole. The entire second summary is reproduced bellow for your reference. You should remember the first and second summary of DDC fully.

000 Computer science, knowledge & systems

010 Bibliographies

020 Library & information sciences

030 Encyclopedias & books of facts

040 [Unassigned]

050 Magazines, journals & serials

060 Associations, organizations & museums

070 News media, journalism & publishing

080 Quotations

090 Manuscripts & rare books


100 Philosophy

110 Metaphysics

120 Epistemology

130 Parapsychology & occultism

140 Philosophical schools of thought

150 Psychology

160 Logic

170 Ethics

180 Ancient, medieval & eastern philosophy

190 Modern western philosophy


200 Religion

210 Philosophy & theory of religion

220 The Bible

230 Christianity & Christian theology

240 Christian practice & observance

250 Christian pastoral practice & religious orders

260 Christian organization, social work & worship

270 History of Christianity

280 Christian denominations

290 Other religions


300 Social sciences, Sociology & Anthropology

310 Statistics

320 Political science

330 Economics

340 Law

350 Public administration & military science

360 Social problems & social services

370 Education

380 Commerce, communications & transportation

390 Customs, etiquette & folklore


400 Language

410 Linguistics

420 English & Old English languages

430 German & related languages

440 French & related languages

450 Italian, Romanian & related languages

460 Spanish & Portuguese languages

470 Latin & Italic languages

480 Classical & modern Greek languages

490 Other languages


500 Science

510 Mathematics

520 Astronomy

530 Physics

540 Chemistry

550 Earth sciences & geology

560 Fossils & prehistoric life

570 Life science; Biology

580 Plants (Botany)

590 Animals (Zoology)


600 Technology

610 Medicine & health

620 Engineering

630 Agriculture

640 Home & family management

650 Management & public relations

660 Chemical engineering

670 Manufacturing

680 Manufacture for specific uses

690 Building & construction


700 Arts

710 Landscaping & area planning

720 Architecture

730 Sculpture, ceramics & metalwork

740 Drawing & decorative arts

750 Painting

760 Graphic arts

770 Photography & computer art

780 Music

790 Sports, games & entertainment


800 Literature, Rhetoric & Criticism

810 American literatures in English

820 English & Old English literatures

830 German & related literature

840 French & related literatures

850 Italian, Romanian & related literatures

860 Spanish & Portuguese literature

870 Latin & Italic literatures

880 Classical & modern Greek literature

890 Other literatures


900 History

910 Geography & travel

920 Biography & geography

930 History of ancient world (to ca. 499)

940 History of Europe

950 History of Asia

960 History of Africa

970 History of North America

980 History of South America

990 History of other areas

iii) Third Summary: In the third summaries, each one of the 100 divisions is further subdivided into 10 sections resulting in 1000 sections. For the copyright issue, the third summary is not included here in this unit. But, you can find the complete summaries of DDC 22nd edition over OCLC website (, and ( The provides the DDC summaries of 22nd edition in a very easy to browse, and search structure. You can also use this interface to obtain the main class number of any document.

You can also find the Dewey Decimal Classification System (13th Abridged) in the website of Near North District School Board (

c) Schedules: Schedules contain the schedules of Class Numbers assigned in numeric order from 000 to 999. To follow the correct use of the Schedules, it is necessary to understand the various notes and instructions suggested in different entries. So, let’s explore the schedule in some details.

            Entries in the schedules and tables are composed of DDC number in the left margin, a heading describing the class that the number represents, and often one or more notes. All entries, numbers, headings, and notes should be read in the context of hierarchy. The first three digits of schedule number appears only once, when first used, in the number column. They are repeated at the top of each page where their subdivisions continue. Subordinate numbers appear in the number column, beginning with a decimal point. The numbers and notes in parentheses provide options to standard practice. Numbers in square brackets represent the topics that have been reallocated or discontinued, or unassigned. Square brackets are also used for standard subdivision concepts that are represented in another location.

            Only a fraction of the potential DDC numbers is included in the schedules. It is often necessary to build or synthesize a number that is not specifically listed in the schedules. If you turn the third page of the schedule (Vol 2), you will see that entries start with the notation “000” at the top of the page and a summary of all divisions and sections below it. In the 5th page you will see the first entry that is “001” which stands for knowledge, and below it the numbers and descriptions and different notes to arrive at the correct class number of a document.

d) Relative Index: The volume 4 contains the Relative Index. It is an alphabetical list of all the subjects given in the Schedules and Tables. It is called the Relative Index because it brings together under the name of the subject the various aspects of a subject which are scattered in the schedules according to the disciplines. This index not only arranges the concepts and their terms in an alphabetical sequence but also shows the relation between the terms and the contexts in which the subjects appear in the Schedule. It is a key to the Schedules as well as an independent approach to classification. In the index, all possible subjects are included under main divisions and sub-divisions so that the classifier finds it easy to search out the possible subjects under the alphabetical list of relative index. The numbers that are given for subjects in the index are readymade numbers, but they are not the same as those of the schedule. The classifier has to finally decide the number himself.

4.3 Steps for Classifying with DDC: While doing the classification of a document one should procede to the class number in the following ways

a) Determine the Subject: First, try to determine the subject of the book or document in your hand. The title often provides a clue to the subject, but it should never be the sole source of analysis. The subject which the book deals with can be determined by going through the table of contents, chapter headings, the preface or introduction, and the book jacket or the accompanying materials.

            If a work includes multiple subjects, class it under the subject that is being acted upon (rule of application). The rule of application takes precedence over any other rule. For instance, class an analytical work dealing with Shakespeare’ influence on Keats with the subject Keats. Class a work (book) on two subjects with the subjects receiving fuller treatment. If two subjects receive equal treatment, class the work with the subject whose number comes first in the DDC schedules (first-of-two rule). For example, history dealing equally with the United States and Japan, should be classed under history of Japan, because 952 Japan precedes 973 United States (even if in the title of the work United States appears first, and it is discussed first in the contents of the work). Class a work in which three or more subjects are treated equally but are all subdivisions of a broader subject in the first higher number that includes them all (rule of three). For instance, a history of Portugal (946.9), Sweden (948.5), and Greece (949.5) is classed with the history of Europe (940).

b) Determine the Discipline: After determining the subject the classifier should try to determine the disciplinary focus and, if possible, the approach or form of the work.

            If a work is dealing with more than one discipline, interdisciplinary number should be provided to the work.

            If you are not able to determine the subject and the discipline of the book in hand, you can consult “The Relative Index”. It will help by suggesting the discipline(s) in which a subject is normally treated.

c) Consult the Schedule: The schedules are the only place where all the information about coverage and use of the numbers may be found. So, once the subject has been determined and information on the discipline has been found, the classifier should turn to the schedules. The summaries, headings and notes within the schedules will provide the necessary guidance to arrive at the appropriate class number.

            In the schedule of DDC, special headings, notes, and entries indicate relationships among the topics that violate the notational hierarchy. The notes are usually given at the highest level of application. For example, the scope note at 700 applies to 730 to 736 and to 736.4. So, during the process of classifying a document the classifier has to turn the pages up and down.

Even if the classifier has used “The Relative Index”, he should still rely on the structure of the classification schedule to arrive at the proper class number of a work. Even the most promising Relative Index citations must be verified in the schedules.

d) Close and Broad Classification: Close classification means that the content of a work is specified by notation to the fullest extent possible. Broad classification means that the work is placed in a broad class by the use of notation that has been logically abridged. For example, a work on French cooking is classed closely at 641.5944 (641.59 Cooking by place + 44 France from the T1), or broadly at 641.5 (Cooking). The DDC provides the basic options of close versus broad classification. A library should choose between these two option based on the size of its collection and the needs of its users. The abridged edition of the DDC is another source for broad classification.

e) Other Points: It should be noted that DDC uses the convention that no number should have fewer than three digits; zeros are used to fill in the numbers. A decimal point (or dot) follows the third digit in a class number, after which division by ten continues to the specific degree of classification needed. The “dot” is not used as a decimal point in the mathematical sense; it used to ease the transcription and copying of the class numbers.

A number should never end in a zero anywhere to the right of the decimal point. Again, subdivisions beginning with zero should be avoided if there is a choice between zero and 1-9 at the same point in the hierarchy of the notation (rule of zero).

4.4 Examples of Classifying a Document with DDC Summaries: Now let’s try to classify some general books practically, wherein we do not require to use seven tables and the details about the Schedules. For classification of such books, the three summaries of DDC and the Relative Index will be enough. Now, for example, take a book whose name is “A Text Book of Geometry”

Here, in the title, it is very easy and expressive enough to determine the subject. Geometry is the branch of Mathematics and it will come under science. So, go to the first summary wherein you will find “500 Science”, then consult the second summary, wherein under 500 you will find “510 Mathematics”. Now, in the third summary under “510 Mathematics”, you will find “516 Geometry”. Now, consult the schedule for verification. In the schedule also the 516 is for Geometry. So, the class number of the above book will be “516”.

            Now, suppose, in lieu of the above approach you want to move from the Relative Index. In such cases, find the word Geometry in the page number 331 of volume 4. Opposite to the word you will find the number “516” in the following format.

Geometry                                516

            famous problems         516.204

            Now consult the schedule for verification. In page number 515 of volume 2, you will find “516 Geometry”, so the class number of the above book will be “516”.

4.5 Classification of Document by Using the Web: The cost of DDC is very high. Every library in India and in other developing countries cannot afford to have a set of DDC as its own. But the classification of the documents in a library is a must. To meet this end, librarians can use some tools and techniques to have a class number of a document they have procured in their library. There are some excellent tools over the web that share the class numbers. Some of these tools and techniques are discussed bellow. They will provide the readymade class number of a document and will save the time of the classifier. We may not require to follow these options if we have a set of DDC. We are to only follow the options listed below in the event of not having a set of DDC. We can also follow these options to verify the class number obtained by consulting the DDC on our own.

a) Classify: An Experimental Classification Web Service: OCLC Research experimental classification service launched “Classify” ( which is targeted to support the assignment of class number and subject heading by using the web. The interface can be used both by a machine as well as human being. It provides access to more than 36 million collectively built records from a large pool of related resources. Each record in the database contains Dewey Decimal Classification (DDC) numbers, Library of Congress Classification (LCC) numbers, or National Library of Medicine (NLM) Classification numbers, and subject headings from the Faceted Application of Subject Terminology (FAST).

In the database of Classify ( by inputting any one or in combination of some basic information related to the document, the class number or subject heading can be obtained. The inputted information may be of the following types-

i) ISBN: You can use the 10 or 13 digit ISBN. The ISBN should be used without hyphens in between. You can find more about ISBN over:

ii) OCLC #: Each bibliographic record in the WorldCat has a unique number that range from 1 to 9 digits in length. You can also use this number to find out the information from the database. More about OCLC  #  is available over:

iii) Barcode / The Universal Product Code (UPC): You can use the 12 digits UPC number found in the document. You can know more about Barcode over:

iv) International Standard Serial Number (ISSN): You can use the eight digits ISSN with or without hyphen (as it is appeared in the document). You can know more about ISSN over:

v) Title and / or Author: You can also use full title of the document or some portion of it or its author or both the title and the author as a combined search.

vi) Faceted Application of Subject Terminology (FAST): You can also use the FAST controlled vocabulary that is based on the Library of Congress Subject Headings (LCSH). You can collect more information about FAST over:

If you go to ( web address and enter the ISBN / ISSN or any standard number correctly in the interface it sometimes shows a “No data found for the input argument” error. But, if you use the title and some portion of the authors’ name of the same document it shows the result. It happens probably because sometimes people perhaps do not entered those fields in the records of the database, while preparing it.

Entering some portion of the title and the first author’s surname (or sometimes the forename) of the document in the interface mostly leads to the relevant document and class number. You can use this option as your first approach to obtain the class number of the document or its subject heading.



Fig. 1 : Home Page of Classify of OCLC


b) DeweyBrowser: The DeweyBrowser ( provides access to approximately 2.5 million records from the OCLC Worldcat database. You can also use this interface to obtain readymade class number of a document in your library. Just make a search by entering the complete title of the document in the search box of the site to have its class number.

Fig. 2 : Home Page of DeweyBrowser


c) ( is a database of books that is built by taking data from hundreds of libraries across the world. It is developed by Andrew Maltsev. He has also a company named Ejelta LLC (, based in San Gabriel, CA. This is one of the outputs of the company. You can enter the keywords, book title, author, publisher, topic or ISBN of the document in its search box to have its class number. After displaying the result by the interface, click on the most relevant title under the heading of “Books Matching (‘your enter title’)” and consult the “Dewey Class:” under “Classification:” heading. Here you will find the classification number of the document you are looking for.

            If you don’t find the heading “Classification:” or you find the heading “Classification:” but don’t find the “Dewey Class:” then you should move to the appropriate title under “Libraries this book has an entry in:”. Now under the “MARC Record” you should consult the number against: 092: $a: or 082. This will be your classification number of the document you were looking for.


Fig. 3 : Home Page of


d) Library of Congress Online Catalogue: To classify document by using Library of Congress Online Catalogue (, enter the address in the address bar of your browser, and then click on “Alternative Interface to the LC Online Catalog (Z39.50)”. It will lead you to a new screen, from where you have to opt for “Advanced Search (multiple terms using Boolean operators)”. In the new page you have arrived at (it will look just like the following) you can search for class numbers by entering different details about the document in your library. Your search term may be the name of the author, title, series, ISBN, ISSN, publisher and many others to choose from. After submission of the details in the interface you have to click on "Submit Query" and then should navigate to “More on this record". Now, against the "Dewey No.:", you will find the class number of the document you are searching for. Please note that for some titles you will not be able to find DDC number in this database, as it was mainly designed by using the Library of Congress Classification number.





Fig. 4 : Home Page of Library of Congress Online Catalogue






Type the title, author and ISBN of ten books recently acquired by your library and classify those titles by following the different online methods listed above.


The WebDewey also offers easy-to-use, World Wide Web-based access to the Dewey Decimal Classification (DDC) and related information, with searching and browsing capabilities. One can also find Library of Congress Subject Headings (LCSH) intellectually and statistically mapped to Dewey numbers; and links from the mapped LCSH to the corresponding LCSH authority records. It is also an excellent tool for online classification of the document, but the bad thing is that it is a paid service. It costs from $ 225-$575 per year.

4.6 Let Us Sum Up: In this unit you have learnt how to classify a document by using the DDC summaries as well as by using different online tools and techniques. Sometimes a book itself may contain the classification number. In such cases, you can simply copy down that classification number from Cataloguing in Publication (CIP) data. The CIP will provide classification number, subject headings, and notes. This type of data is very common in the verso of the title page of many books published from U.S., Australia, British, and Canada. So, if you have a book published from the above countries, try to find the CIP data and copy it to your document.

            The unit takes into account the Dewey Decimal Classification (DDC) that includes the structure of the DDC consisting of Tables, Summaries, Schedules and Relative Index. Classification of document by using the web is another important point of discussion in the unit. In this section the relevant matter includes “Classify”, Dewey Browser, and Library of Congress Online Catalogue. Each of these concepts has been exercised to give an idea about the use of the web for classification.

5. Library of Congress Classification: In 1898 a group under the guidance of J. C. M. Hanson, the head of the catalog division at the Library of Congress in Washington, D.C, and Charles Martel, the library’s chief classifier, developed the first part of the Library of Congress (LC) Classification system. In the years that followed, numerous specialists contributed to the further development of the system and expanded it to cover other subject areas.

The Library of Congress Classification system divides human knowledge into 21 major classes, using letters of the English alphabet for each, with further subdivisions indicated by decimal notation. The system does not use the letters I, O, W, X, and Y.

The major classes of the Library of Congress Classification system are as follows:

A General works

B Philosophy; psychology; religion

C Auxiliary sciences of history

D History: General and Old World

E-F History: America

G Geography; anthropology; recreation

H Social sciences

J Political science

K Law

L Education

M Music and books on music

N Fine arts

P Languages and literature

Q Science

R Medicine

S Agriculture

T Technology

U Military science

V Naval science

Z Library science

6. Universal Decimal Classification: UDC, which was designed to facilitate the organization of a universal bibliography of all recorded knowledge, first made its origin at Belgium in 1895 by bibliographers Paul Otlet and Henri La Fontaine. Initially UDC was based on the fifth edition of the Dewey Decimal Classification that combines notation to express multiple concepts. The Universal Decimal Classification system is issued by the International Federation for Documentation, in the Hague, Netherlands, which is responsible for its ongoing revision.

7. Colon Classification: In 1933 Indian librarian Shiyali Ramamrita Ranganathan introduced the Colon Classification system, which classifies all knowledge into broad, fundamental concepts. The Colon system then divides these concepts into several distinguishing characteristics, which Ranganathan called facets. The classification system uses colons (:) to distinguish between the various facets in a single notation and the name “Colon Classification system” is derived from its use in its notation scheme.

In United States, most research and academic libraries use Library of Congress Classification, while most schools and public libraries use Dewey Decimal Classification. The UDC system is widely used in Europe, Latin America, Russia, and Japan. Although the use of the Colon Classification system is limited to a few Indian libraries, Ranganathan’s concept of facet analysis in classifying knowledge has been widely recognized. Some of its key concepts have been adopted by subsequent editions of the DDC or UDC, among others.





Classifier: The library professional who is engaged in the process of classifying of library materials is called a classifier or classifier librarian.


8. Allotting Class Number: In classifying, a classifier first takes up those books which are additional copies or new editions of works available in the library. In such cases, he/she would put down the call number in the book order slip and on the process slip along with the fact whether the book in hand is an additional copy or a new edition. Sequence numbers are also copied in the processing slip. The rest of the books received by a classifier are sorted by basic classes. The indexes attached to the classification schedules are used to find out the basic class numbers. Each basic class is taken, one by one. In the process of classification, based on the subject content of the item, a class number is assigned by consulting the schedules. The classification of the document can be made by manual means or by copy cataloguing, etc. The practice of complete reliance on the indexes for deriving the class number of any document is not advisable. The class numbers so arrived at should be tallied with the other standard catalogues, if necessity arises, especially in doubtful cases. The class numbers are given in pencil on the upper half portion of the verso of the title page. It is in pencil, because in case there is some changes in the class numbers, in future it may be corrected without any damage to the book by rubbing the earlier class numbers. This phenomenon is common because almost every classification scheme is revised periodically.

9. Allotting Book Number: Generally, the author marks constitute a book number. Cutter’s Author Table, Cutter-Sanborne Author Table, Merrill’s Author Table, Author Tables of L. Stanley Jast, Biscore Time Numbers, Ranganathan’s Book Numbers System may be used to allot author marks. A decision is to be taken by each library as to which system is to be used for allotting book numbers.

The class number and book number together constitute the call number of the book. The call numbers should be written on the processing slips, adding the sequence number, wherever required.

10. Assigning Subject Heading: Subject heading is the words or group of words under which books and other materials on a subject are entered in a catalogue. The heading may include punctuation to which an arranging significance may be assigned. In a classified catalogue the subject heading consists of a classification symbols with or without its verbal meaning. It may also include entries for all materials on the same subject in an index or bibliography. For assigning subject heading, Library of Congress List of Subject Headings, Sears List of Subject Headings, ALA List of Subject Headings, Ranganathan’s Chain Procedure may be used. The chain procedure method is useful in deriving proper subject headings. The smaller libraries, where minute subject headings are not required, may use Sears List of Subject Headings or ALA List of Subject Headings. But large, research or special libraries may use the Library of Congress List of Subject Headings which is a very comprehensive and standard one. Each library due to some local and special conditions may adopt certain subject headings of its own in order to meet the readers’ demand.