The entity-relationship model—toward a unified view of data
ACM Transactions on Database Systems (TODS) - Special issue: papers from the international conference on very large data bases: September 22–24, 1975, Framingham, MA
Database abstractions: aggregation and generalization
ACM Transactions on Database Systems (TODS)
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This paper suggests that two levels should be considered when designing a conceptual schema: the 'understanding level' and the 'conceptual data base level'. The first level includes two realms of importance • the set of information requirements (IRQ) and • the conceptual information model (CIM). The next level includes two realms: • the conceptual data base model (CDBM) and • the conceptual processing model (CPM). The CIM is a full time-perspective, unrestricted view of the enterprise and aims at defining relevant relationships, events and inference relations. The CDBM is, together with CPM, a data base realization of CIM which satisfies IRQ. In this paper designs at both levels are illustrated and the utility of the conceptual information model is discussed.