1.1 This Introduction explains the basic principles and structure of the Dewey Decimal
Classification (DDC) system.
1.2 The Introduction is intended to be used in conjunction with the Glossary and the Manual.
The Glossary defines terms used in the Introduction and elsewhere in the Classification.
The Manual offers advice on classifying in difficult areas, and explains how to choose
between related numbers.
Classification: What It Is and What It Does
2.1 Classification provides a system for organizing knowledge. Classification may be used
to organize knowledge represented in any form, e.g., books, documents, electronic
resources.