🌍 Global Reach
Today, UDC is used in over 130 countries, primarily in academic libraries, national archives, and specialized institutions...
🧩 How UDC Works: Structure and Notation
🔢 1. The 10 Main Classes
| Code | Category |
|---|---|
| 0 | Generalities, Information & Knowledge |
| 1 | Philosophy, Psychology |
| 2 | Religion, Theology |
| 3 | Social Sciences |
| 4 | (Unused – reserved for expansion) |
| 5 | Mathematics, Natural Sciences |
| 6 | Applied Sciences, Medicine, Technology |
| 7 | Arts, Entertainment, Sports |
| 8 | Language, Literature |
| 9 | Geography, History |
🧠 2. Hierarchical Notation
Each number can be extended to represent more specific subjects:
61→ Medical Sciences616→ Diseases616.2→ Infectious Diseases
🔀 3. Faceted Classification
UDC allows combining codes to represent interdisciplinary subjects like 159.9+61 for "Psychological aspects of medicine".
🌟 Benefits of Using UDC
- ✅ Universal Applicability
- ✅ Scalability
- ✅ Navigation-Friendly
- ✅ Digitally Adaptable
🏛 Real-World Examples
- UNESCO Library: Multilingual management
- National Library of the Czech Republic: Digital use case
- Medical Libraries: Classifying diseases, treatments
⚠️ Limitations
- ❗ Complex for Beginners
- ❗ Needs Regular Updating
- ❗ Requires Training
🧭 Conclusion
Universal Decimal Classification remains a smart, structured, and scalable approach to organizing knowledge for the 21st century.
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