2 MODELLING THE THINGS OF INTEREST TO THE BUSINESS AND THE RELATIONSHIPS BETWEEN THEM

This chapter introduces the basic modelling concept of the entity, to represent something of interest to the business about which information needs to be recorded, and the related concept of the entity type, the representation of a group of entities with common characteristics. The relationships between entity types are also introduced. Alongside the introduction of these concepts, the comparable concepts of object, object class and association are also introduced.

ENTITIES AND OBJECTS

Put simply, an information or data model is a model of the things of interest to a business about which information needs to be recorded.

In Figures 2.1 and 2.2 are two models ...

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