Classified Catalogue Code ,Classified catalogue code (CCC), S.R. Ranganathan, Information system, OPAC, Database management system (DBMS) card catalogue and online catalogue, and emphasises on the need of developing computer-based library information systems and services. It describes database technology, kinds of databases, database management system, computerised library information system, and management information system. It coven in detail the database design and compatibility of cataloguing codes for developing databases of computer-based library information systems.