Abstract
The importance of a conceptual schema for a successful data base design is widely accepted today. Its development remains however a major problem during the logical design of a data base system. A number of problems related to the role, structure and implementation of a conceptual schema for an enterprise are briefly discussed in this article and a conceptual schema structure and design methodology is proposed that should help meet the requirements of the users in an optimal way. An appropriate data base model structure is also proposed; it provides the necessary underlying structure for the conceptual schema and helps overcome some of the problems currently encountered.
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