Easy Notation but Less Power

• Rule Based Systems have a really simple notation
• People can easily understand the if then rule structure
• It's easy to generate rules
• However, it lacks the organisation that structured programming gains from looping and function calls.
• Formally they are the same (Turing Complete), but it's harder to do complex stuff with ESs (e.g. card dealing).
• It also gets hard to keep track of large Rule Based systems (over 1000 rules).
• Structured and OO programming are easier to manage.