27. The method of claim 26 , comprising assigning a score to the one or more query term optionalization rules that are specific to the particular query term based at least on the click count and the skip count.
30. The method of claim 27 , wherein the score assigned to the one or more query term optionalization rules that are specific to the particular query term satisfies: W ⁢ ⁢ 1 ⁢ ( click ⁢ ⁢ count ) W ⁢ ⁢ 1 ⁢ ( click ⁢ ⁢ count ) + W ⁢ ⁢ 2 ⁢ ( skip ⁢ ⁢ count ) wherein W1 represents the weight associated with the click count and W2 represents the weight associated with the skip count.