Categories of Business Rules
According to the white paper by the Business Rules Group, a statement of a business rule falls into one of four categories:
- Definitions of business terms
The most basic element of a business rule is the language used to express it. The very definition of a term is itself a business rule that describes how people think and talk about things. Thus, defining a term is establishing a category of business rule. Terms have traditionally been documented in a Glossary or as entities in a conceptual model.
- Facts relating terms to each other
The nature or operating structure of an organization can be described in terms of the facts that relate terms to each other. To say that a customer can place an order is a business rule. Facts can be documented as natural language sentences or as relationships, attributes, and generalization structures in a graphical model.
- Constraints (also called "action assertions")
Every enterprise constrains behavior in some way, and this is closely related to constraints on what data may or may not be updated. To prevent a record from being made is, in many cases, to prevent an action from taking place.
- Derivations
Business rules (including laws of nature) define how knowledge in one form may be transformed into other knowledge, possibly in a different form.
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