An auditing system and method for analyzing email, including capturing email transferred over a network and transferring the email to a data analyzer. The KPI correlation search definition includes search information and trigger determination information. In various embodiments, the refining is carried out without reordering the disjunctions andor without merging the disjunctions. Filter may comprise the same digital signal processor as the coefficient calculator. The method is applicable to any network of transistors whose characteristics depend, at least in part, on its implementation topology.