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What is a business rule?
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What is a business rule?
A business rule is a written statement specifying what the information system
must do or how it must be structured to support business needs.
A business rule is a rule that your business follows. A business rule could be
a government-imposed law, a customer requirement, or an internal guideline.
Business rules often start as simple observations, for example "customers call
toll-free numbers to place orders." During the design process they develop
into more detailed expressions, for example what information a customer
supplies when placing an order or how much a customer can spend based on
a credit limit.
Business rules guide and document the creation of a model. For example, the
rule "an employee belongs to only one division" can help you graphically
build the link between an employee and a division.
Business rules complement model graphics with information that is not easily
represented graphically. For example, some rules specify physical concerns
in the form of formulas and validation rules. These technical expressions do
not have a graphical representation.
You can attach business rules to objects in an OOM. You can generate
business validation rules as check parameters if the validation rules are
attached to domains.
$ For more information on defining and using check parameters, see the
chapter Building an Object-Oriented Model.
Starts as an
observation
Guides modeling
Complements
graphics
Check parameters