Business rules will normally begin life as textual notes in the process model. This is because
they will be gathered during a process development workshop and written straight into the
process model. Once the process model is stable, then business rules should be formalised
in this Business Rules Document and given a unique reference number within the hi-level
process/project/system model from which they have been derived. Once formalised, the
business rule reference in the form BR n[.m] should replace the textual note in the process
model from which it has been derived.
Note that a single business rule may apply across multiple processes in the process model,
also to data in the business data (conceptual) model and to statecharts for entities in the
business data model. Where it is realised that the rule applies in more than one place, the
reference to the rule, in the form BR n[.m], should also be made in the textual note property
of each element. The elements could be entities, attributes, roles and relationships in the
business data model, or states, events, transitions and conditions in the business state model.