Generalization

• Generalization is like a bottom-up approach in which two or more entities of lower-level levels combine to form a higher-level entity if they have some attributes in common.
• In generalization, an entity of a higher level can also combine with the lower level entities to form a further higher-level entity.
• Generalization is more like a subclass and superclass system, but the only difference is the approach. Generalization uses the bottom-up approach.
• In generalization, entities are combined to form a more generalized entity, i.e., subclasses are combined to make a superclass.

For example, Faculty and Student entities can be generalized and create a higher level entity Person.