A business rule is a declarative condition or constraint that specifies an organizational decision or action for particular circumstances. It turns policies and expertise into decisions that systems can apply consistently, such as approving a loan when an applicant exceeds a credit-score threshold and has stable income. section 2.2
Business rules management systems (BRMSs) centralize, manage, and automate complex decision-making. They support business users or analysts through rule-authoring interfaces, store rules in a repository, and use a coherence module to prevent contradictions between rules. section 2.2
Rules in practice
A financial institution can evaluate loan eligibility using credit scores, income levels, and debt ratios. Hospitals can automate admissions using bed availability, patient conditions, and medical protocols. Vehicles can follow rules for speed limits, traffic lights, right-of-way, pedestrians, road closures, weather, and unexpected stops. section 2.2
Business rules systematize decision-making and provide a practical bridge between captured expertise and automated action. Their value depends on defining, organizing, testing, and checking rules as organizational decisions change. section 2.2 section 2.0
