Have found 'patterns' to be a more useful represenation for experience and heuristics than rules as there are pointers to related patterns, context is explicit and you get to stay away from 'dangerous places' if you incorporate anti-patterns aka lessons learned / known failures into the mix.

Knowledge systems always battle with the mix between expressiveness and inference. Having been well down the inference path, I'm inclined to see rules almost as a anti-pattern nowdays.