Question

Answer the following questions . [15 marks] 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): A, B, C Rules 1. A D (means that if A is true then D is true) 3. B&D- E (means that if B and D are both true then E is true) 11. E& F-J 12. DG a. [5 marks] Which rules would fire and in what order if we used forward chaining assuming the system starts at rule 1 and goes to rule 11 and repeats until all of the rules have fired that can be fired-show the order that the rule numbers fire (e.g. 1 2, 9,6) and state the number of passes through the rule set we need to use. Which facts do we know to be true after forward chaining has completed? b. [5 marks] Using backward chaining, prove that Z is true. Which rules and in what order, would fire to accomplish this? What facts do we know after backward chaining has completed? c. [5 marks] 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

Answer 1

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