UDC Basis: Derived from Dewey Decimal Classification

The Universal Decimal Classification (UDC) is a comprehensive library classification system. Its development and structure are heavily influenced by another well-known system, the Dewey Decimal Classification (DDC).

Specifically, the UDC was initially developed in the late 19th and early 20th centuries based on the earlier editions of the DDC. The question asks which edition formed the basis for the UDC.

The foundational version of the DDC upon which the early development of the UDC relied was the 5th edition of DDC. While the UDC has since been expanded and modified significantly to accommodate a wider range of knowledge and international usage, its initial structure and core principles trace back to this specific edition of the Dewey system.

Key Points:

• UDC (Universal Decimal Classification) is an international system.
• It originated from the DDC (Dewey Decimal Classification).
• The specific edition that served as the primary basis for UDC's development was the 5th edition of DDC.
• UDC introduced features like multilingual support and flexible notation, differentiating it from the DDC over time.