The purpose of this paper is to look into how best the certain techniques of database technology and traditional library tools and techniques can be converted as an effective tool for designing and developing the computer-based
library information systems and services. This paper proposes a code for developing library information systems or their databases for converging the techniques belonging to the domain library and information science and the domain of information technology for designing, developing and implementing
computer-based library information systems and services. The paper explains briefly, various concepts relating to specifying conceptual schema of a library database; identify and specify the various entities or entity-types that are associated with library systems.