Databases have become an integral part of the modern society. In everyday life, we encounter several activities that involve use of databases such as withdraw of money from bank, getting railway reservation tickets, issuing a book from library, etc. When database of a large application is designed, the database designer has to deal with its large sized schema. He/she faces problems related to its representation, communication, comprehension, and documentation. This thesis addresses the problem of large sized database schema prepared using Entity Relationship (ER) model and proposes two...