Question 11 :
Generalization is the process of defining more general entity types from a set of more specialized entity types.
Question 12 :
It is appropriate to use a supertype/subtype relationship when there are attributes that apply to some of the instances of an entity type.
Question 13 :
If an entity adheres to the disjoint rule, then an entity instance can be a member of more than one entity for a given supertype.
Question 14 :
Action assertions have traditionally been implemented within an application program.
Question 15 :
An entity cluster is a set of one or more entity types and associated relationships.