Padmashri Professor S R Ranganthan(1892-1972) is aptly revered as the father of library science in India. His Colon Classification (1933), based on the concept of facet analysis, has been acknowledged as a greatest breakthrough in library classification all over the world. It is India’s de facto national classification which is being used in many university, college, special and public libraries in the country. Its principles are taught in all the library schools the world over. In India its theory and practice is given high weight-age in every library science school curriculum. In 1957 an international conference held in England accepted facet analysis as the basis of information retrieval both in manual and automated systems. His work has gained so many acceptances that it forms the very bedrock of new researches in library science, and finds applications in new fields such as database Management Systems (DBMS), Web searching, artificial intelligence and expert systems. He is to library science what Einstein is to physics, says Eugene Garfield. His work has been considerably furthered by some of his British and Indian disciples. International library experts and organizations such as UNESCO and International Standards Organisation (ISO, The Hague) always sought and valued his advice. His influence in international librarianship was all pervasive. Perceptible library historians have acknowledged and elucidated his concrete influence first on British and through it on American librarianship. This book explains the theory and procedures for practical application of the Colon Classification. It begins with a chapter on the life and achievements of professor Ranganthan. It explains with ample examples every major and minor rule to understand and apply for number synthesis. It has 40 chapters and four appendices. Titles of books have been given in English and Punjabi both. A glossary of English-Punjabi and Punjabi–English terms has been given in the end. It is a student oriented book which is simple, self explanatory and illustrated with examples from the latest publications.