What is DDC system?

The DDC (Dewey Decimal Classification) system is a library classification system that organizes knowledge into a hierarchical structure, making it easier to locate books and other materials in a library. Developed by Melvil Dewey in 1876, the DDC system is one of the most widely used classification systems in libraries around the world, particularly for organizing books and other resources in public and school libraries.

Structure of the DDC System

The DDC system divides knowledge into ten main classes, each representing a broad subject area. These main classes are further divided into divisions and sections, providing a detailed and structured way of organizing content. Here’s a basic breakdown of the ten main classes:

1. 000 – General Works
   Covers works about bibliographies, libraries, and information technologies (including computers, Internet, and publishing).

2. 100 – Philosophy & Psychology
   Includes works on philosophy, logic, ethics, and the study of the mind.

3. 200 – Religion
   Covers all aspects of religion, including religious texts, theology, mythology, and belief systems.

4. 300 – Social Sciences
   Encompasses topics such as sociology, economics, education, law, politics, and customs.

5. 400 – Language
   Covers linguistics, languages, language learning, and communication.

6. 500 – Natural Sciences & Mathematics
   Includes biology, chemistry, physics, astronomy, earth sciences, and mathematics.

7. 600 – Technology (Applied Sciences)
   Includes engineering, medicine, agriculture, home economics, and other applied sciences.

8. 700 – Arts & Recreation
   Covers the visual arts, performing arts, music, sports, and leisure activities.

9. 800 – Literature
   Encompasses all forms of literature, including fiction, poetry, drama, and literary criticism.

10. 900 – History & Geography
    Includes works on geography, history, biography, travel, and archaeology.

Features of the DDC System

• Decimal Structure: The DDC system uses a decimal notation, which allows for fine subdivisions of topics. For example, books about psychology might be classified under 150, while books on philosophy might fall under 100, with more specific topics like logic (160) or ethics (170) having their own subcategories.

• Flexibility: The DDC system is designed to be flexible, allowing libraries to create unique classifications for specific subjects. This helps libraries accommodate the ever-growing variety of materials and knowledge.

• Continuous Updates: The DDC system is regularly updated to reflect new knowledge and emerging fields. The most recent editions contain updated classifications for new technologies, scientific advancements, and cultural trends.

How the DDC System Works

• Class Numbers: Each subject is assigned a unique number. For example, "Technology" is assigned the number 600, and books on "Medicine" fall under 610. Subdivisions of subjects are indicated by adding more digits after the decimal point (e.g., "Psychology" is 150, while "Abnormal Psychology" is 155).

• Call Numbers: In a library, each book is labeled with a call number, which reflects the DDC number for its subject. This call number typically appears on the spine of the book and is used to arrange books on the shelf.

• Subcategories: The DDC uses subcategories to further break down topics. For instance:

  • 300 (Social Sciences) can be further divided into 310 (Statistics), 320 (Political Science), 330 (Economics), and so on.
  • Each of these subcategories may have further subdivisions, allowing libraries to fine-tune their organization.

Example of the DDC in Action

If you want to find a book on Psychology, you would look in the 150s section of the library. More specifically:

• 150 – Psychology
• 152 – Perception, Movement, and Emotion
• 153 – Mental States and Processes

If you are interested in a more specialized area, like Abnormal Psychology, you would go to:

• 155 – Abnormal Psychology

Advantages of the DDC System

1. Organization: The DDC system helps organize large volumes of knowledge into manageable categories, making it easier for users to find books and materials on similar subjects.

2. Global Use: The DDC is used worldwide and provides consistency across libraries in different regions. This makes it easier for libraries to share and exchange resources and catalog records.

3. Adaptability: As new knowledge emerges, the DDC system is regularly updated, allowing libraries to continue to classify new subjects and areas of interest.

4. Accessibility: The decimal structure of the system makes it easy to locate materials based on their subject matter and ensures that similar topics are grouped together for easy access.

Conclusion

The Dewey Decimal Classification (DDC) system is a time-tested and efficient way of categorizing books and resources in libraries. Its decimal-based structure allows for a comprehensive and detailed organization of knowledge, ensuring that users can easily find materials related to specific topics. As libraries continue to evolve and acquire new materials, the DDC system remains an essential tool for organizing and providing access to the wealth of information available to the public.