Synopsis This book Knowledge Organization, Information Processing and Retrieval: Practice is the third volume in the series of books on the UGC Model Curriculum being brought out by the author for the two year integrated M.LISc. programme. This volume covers practical aspects of the following: 1. Colon Classification, Edition 7; 2. Dewey Decimal Classification, Edition 21; 3. Colon Book Number; 4. Anglo-American Cataloguing Rules (1998 Revision); 5. Classified Catalogue Code, Edition 5 (Revised); and 6. Sears List of Subject Headings, Edition 17. Effort has been made to explain all important rules and principles and illustrate them with suitable examples. Exercises are given at the end of the chapters for practice of the students. Solutions to these exercises are given under Unit: VII. This book will come handy to teachers and students of library and information science as well as classifiers and cataloguers in libraries.