Consider the following set of known facts and rules for a production system. (Check the Forward and Backward Chaining slides in the Rule Based Systems file in Module 3 for an example).

Facts (known to be true): L, M, N

Rules:

1. L ? O (means that if L is true then O is true)

2. M & N ? Q (means that if M and N are both true then Q is true)

3. N ? R

4. P & Q ? S

5. R ? U

6. P ? W

7. T & W ? Z

8. S & U ? V

9. O ? T

10. M & O ? P

11. R & X ? Y Using this example, what have we learned about the applications for forward and backward chaining? Give an example of a situation where each would be the best choice.