Consider the following rules: rule (1) when a: Criteria( $criteriaA : criteriaA, $criteriaB : criteriaB ) b: Criteria(){ matchCriteriaA == true && criteriaA == $criteriaA || matchCriteriaB == true && criteriaB == $criteriaB } then ... end rule (2) when a: Criteria( $criteriaA : criteriaA, $criteriaB : criteriaB ) b: Criteria(){ eval( matchCriteriaA == true && criteriaA == $criteriaA || matchCriteriaB == true && criteriaB == $criteriaB ) } then ... end I am seeing different behavior for the same test cases. I am basically inserting "a" and "b" with matching criteriaA and criteriaB and I am testing different combinations of matchCriteriaA and matchCriteriaB (i.e. F/F, F/T, T/F, T/T). Results for rule (1): F/F -> rule activated (incorrect) T/F -> rule activated (correct) F/T -> rule activated (correct) Results for rule (2): F/F -> rule activated (incorrect) T/F -> rule activated (correct) F/T -> rule activated (correct) Any ideas?