Which Objects and Which Relationships?
The structure of the data model is, of course, built on the object types and the relationships, which we have already discussed.
But more general issues arise from picking the right objects.
We do have some generally applicable tools in our tool belt, as follows:
Abstraction, generalization, and specialization (aka aggregation)
Classification and typing
Lifecycle dependencies and versioning
Recognizing hierarchies
There are also some problem areas to be aware of:
One-to-one relationships
Many-to-many relationships and nested object types ...
