Ripple-down rules

Ripple-down rules (RDR) are a knowledge acquisition and management method used primarily in the field of artificial intelligence and expert systems. They provide a structured way to represent knowledge in a way that is easily understandable and modifiable. The key features of ripple-down rules include: 1. **Incremental Knowledge Addition**: Ripple-down rules allow for the incremental addition of knowledge to a system. New rules can be added without needing to rewrite or overhaul existing rules.