A sub-committee of the IBM user group, GUIDE, was formed in the early 1990s to articulate exactly what constituted business rules, and how to describe them. In 1995, it published the white-paper “Business Rules: What Are They Really?” This laid out four categories of rules:
· Terms – The words that describe the things that constitute the business. These are usually captured as entity classes and attributes in a data model.
· Facts – The linking of terms together to assert something about the business. These are usually captured as relationships in a data model.
· Definitions – These are terms that are derived from other terms. Computed attributes can be displayed in a data model, but the ...