Data modeling is the most important part of systems development because data characteristics are important in designing programs and systems components, and data play a central role in development. A business rule defines or constrains some aspect of the business. Business rules should be determined from multiple sources like policies, manuals, and contracts rather than just executives. Attributes are properties of interest to an organization about entity types, and relationships associate entity types rather than attributes. Good data names should be meaningful, unique, and technical.

1. Database Q&A
Data modeling may be the most important part of the systems development
process because:
a) It is the easiest
b) Data are less stable than processes.
c) Data characteristics are important in the design of
programs and other systems components
d) The data in a system are generally less complex than
processes, and play a central role in development
2. A business rule:
a) Defines or constrains some aspect of the business
b) Asserts business structure
c) Controls or influence the behavior of the business
d) All of the above
3. Business rules should be determined primarily by interviewing
executives in the business.
a) True
b) False
REASON: Business rules should be determined from many sources,
including policies, manuals, contracts, and brochures.
4. The common types of entities are:
a) Strong entities
b) Weak entities
c) Associative entities
d) All of the above
5. A property or characteristic of an entity type that is of interest to the
organization is called a(n):
a) Relationship
b) Cross-function
c) Coexisting entity
d) attribute
6. A relationship is an association between attributes.
a) True
b) False
REASON: A relationship is an association between entity types.
7. A good data name should be:
a) Readable, repeatable and technical
b) Meaningful, technical, and unique
c) Repeatable, short, and meaningful
d) readable, unique, and repeatable
REASON: These are just a few of the characteristics of a good data
name.