If a system with production rules and a rule-interpreter then the system is known as a production system. In these systems, the working memory of the system models human short-term memory while productions are part of long-term memory.
Rules of Production System:
Rule-1: Production systems represent both knowledge as well as action. Rule-2: Production systems provides a language in which the representation of expert knowledge is very natural. Rule-3: Production systems provides a heuristics model for human behaviour. Rule-4: Production systems model strong data-driven nature of intelligent action. Whenever new inputs enter the database, the behaviour of the system changes. Rule-5: Production systems allows us to add new rules easily without disturbing the rest of the system.