This book introduces novice catalogers to the practice of subject cataloging. Dealing with the fundamental questions of the purpose of classification and the needs and expectations of end users, the reader is introduced to the ways document content can be assessed and expressed for translation into the language of specific indexing and classification systems. The characteristics of the major schemes of classification and their suitability for different needs are discussed. The emphasis of all chapters is on the practical application of classification schemes, with coverage on: needs, purpose, and rightness of classification, document analysis and description, controlled indexing languages, concept and word based retrieval, structure and varieties of classification, management considerations, and more. This book is essential for all library school students and practicing librarians.