Object integration in logical database design

View integration is one of the important phases in logical database design. During this phase, the individual views designed by separate user groups within the organization are integrated into a conceptual schema for the entire organization. In this paper, we present rules for some of the aspects of view integration, namely integration of entity classes in different views. We then compare our rules with previous approaches, and discuss some of the problems which have to be solved for other aspects of view integration.