Ever since its evolution in 1876, Dewey Decimal Classification (DDC) has been the world's most widely used library classification system. It is expected from all professionals, paraprofessionals, and library students to at least have a working knowledge of cataloguing basics, particularly the DDC, owing to its extensive application in almost all the Indian libraries. In this respect, the present book is the most appropriate as it skilfully acquaints the readers with this system, which is the simplest scheme of coordinating the titles on the same subject and on related subjects by using a combination of letters and numbers and thereby facilitating location of books on the shelves of library. The present book is highly recommended for professionals and paraprofessionals seeking professional development, students wanting to supplement their courses with practical applications and library schools offering distance learning courses in cataloguing. Students and teachers of Library Science will particularly find this book useful.