Business Rules

There is no formal science of business rules.

They attempt to map business knowledge and policies into executable systems.

"Business rule" is a misnomer. They include both things and their behaviors - "objects" and "rules".

A number of business and system modeling tools hold problems, requirements, notes, or other text in a catalog of business issues. See for example, CASEwise, LBMS Systems Engineer, Silverrun, System Architect, Visible Workbench.

A few data modeling tools (e.g., PowerDesigner) provide features to capture business rules and connect them to modeled objects.