Rule Based System Architectures and rules vs. structured programming

• Rule Based Systems (RBSs) are a different way to program.
• They've been around a long time; they probably (depending on how you argue it) predate structure programming.
• Code consists of rules. There is an extra structure, the current facts.
• It's really easy to write relatively simple programs in RBSs.
• It was really big in the 70s with expert systems.
• They're still useful as ESs and in symbolic reasoning.