Library classification is constantly being influenced by multifaceted, multidimensional and infinite growth of literature on one hand and the users needs on the other. With the emergence of computer technology, the library classification is being metamorphised. This book attempts to delve a state-of- the-art of library classification in the new computer age. Technical services are as a mix of skilled and professional jobs to provide user services in libraries. Technical services have been with the libraries throughout their evolution from the days of clay tablets, papyrus to paper and virtual libraries. Technical services have evolved making use of available technology of the day. In the days of all powerful and era-defining information technology, the technical services are still necessary to help libraries to accomplish their mission of connecting iusers with the needed information. The book contains useful information on the technologies of cataloguing, evolution of cataloguing codes, structure of library catalogues, etc. describing the characteristics of users, their information requirement and other related issues. It also contains a comparative, analytical and critical study that evaluates the works of classification systems.