8. The method of claim 7 , further comprising the steps of assigning a head rule at the logical top of the rule base a probability of being selected of 2r/r(r+1), where r is the total number of rules in the knowledge base, assigning a logical next rule a probability of being selected of 2(r−1)/r(r+1), and continuing to assign each successive rule a probability of being selected such that a logical last rule has a probability of being selected as 2/r(r+1).
9. The method of claim 8 , wherein the step of selecting comprises the step of calculating a 3-2-1 skew.