> with modern AI Expert systems are classic AI, often with a rule engine underpinning it. It really could not be simpler in context and this is what makes them

> with modern AI Expert systems are classic AI, often with a rule engine underpinning it. It really could not be simpler in context and this is what makes them good. Everything is simple, the knowledge in it (i.e. the codified expert opinion) is what makes it what it is.