It is almost Ninety years since the Colon Classification was first published in 1933. It is an important landmark in the development of classificatory thought. It introduced many new features. Within this short period, the scheme has developed considerably and has attracted a substantial amount of literature. More than this, the techniques forged by this scheme have received international attention. Some of its features are slowly permeating the fabric of other schemes. The fifth edition of this unique scheme has come out recently. It is proposed to give a short account of the various stages of development of the Colon Classification and the new features added to it from time to time. The scheme was worked out earlier and tried in the Madras University Library. In its very approach it differs fundamentally from the existing schemes of classification. It introduces an element of notational flexibility that is lacking in the enumerative schemes such as the Decimal Classification and the Library of Congress Classification. Generally the enumerative schemes give only ready-made class numbers. This adds to the bulkiness of their schedules and at the same time makes it difficult to accommodate new topics not enumerated in them. This book explains the decimal classification and colon classification in perspectives. This book will bring new insights in the field of decimal classification and colon classification.

Onkar Kshitij has served as an adjunct professor besides being known for his expertise in the field of library science and classification systems. With a strong educational background in Library Science, Onkar Kshitij brings a wealth of knowledge and understanding to his work. His advanced degrees have equipped him with the necessary tools to analyze and evaluate classification systems. Through his practical experience in library administration and management, he has witnessed firsthand the impact of classification systems on information organization and retrieval. Onkar Kshitij's research efforts have led to the publication of numerous papers and articles. His work explores the intricacies of classification systems, shedding light on their practical applications and potential for improvement. His research contributions have been well- received in the academic community, leading to invitations to present at prestigious seminars and conferences.

Parth Mallya serves as a Programme Coordinator at a Private Institution. Parth Mallya's educational background includes PhD in Library Science, providing him with a strong academic foundation in the field. Complementing his academic achievements, he has amassed extensive hands-on experience in library administration and management, successfully implementing and optimizing classification systems, including Colon Classification. Mallya's expertise and insights have been sought after, leading to invitations to speak at prestigious seminars and conferences, where he has shared his knowledge and engaged in fruitful discussions with fellow professionals. His research endeavors have resulted in the publication of numerous papers and articles, focusing on the practical applications of classification systems in modern library management.