Generalization and specialization are the Enhanced Entity Relationship diagram (EER-diagram)

1. Generalization : It works on the principle of bottom up approach. In Generalization lower level functions are combined to form higher level function which is called as entities. This process is repeated further to make advanced level entities.

In the Generalization process properties are drawn from particular entities and thus we can create generalized entity. We can summarize Generalization process as it combines subclasses to form superclass.