21. A computer implemented method for developing a classifier for classifying electronic communications comprising: (a) developing an expression of labeling criteria in an interactive session with a user, wherein the interactive session includes querying a user to identify a phrase that indicates that a communication is not related to a concept and receiving a user identification of the phrase; (b) presenting electronic communications to the user for labeling as relevant or irrelevant, wherein the electronic communications are user-generated; (c) developing a classifier for classifying electronic communications based upon the phrase and the relevant labels and the irrelevant labels assigned by the user; (d) deploying the classifier for use in classifying electronic communications based upon the phrase and the relevant labels and the irrelevant labels; (e) storing a set of electronic communications labeled by the classifier in a memory; and wherein at least one of (b) and (c) use the expression of labeling criteria developed in (a).
21. A computer implemented method for developing a classifier for classifying electronic communications comprising: (a) developing an expression of labeling criteria in an interactive session with a user, wherein the interactive session includes querying a user to identify a phrase that indicates that a communication is not related to a concept and receiving a user identification of the phrase; (b) presenting electronic communications to the user for labeling as relevant or irrelevant, wherein the electronic communications are user-generated; (c) developing a classifier for classifying electronic communications based upon the phrase and the relevant labels and the irrelevant labels assigned by the user; (d) deploying the classifier for use in classifying electronic communications based upon the phrase and the relevant labels and the irrelevant labels; (e) storing a set of electronic communications labeled by the classifier in a memory; and wherein at least one of (b) and (c) use the expression of labeling criteria developed in (a). 27. The method of claim 21 wherein developing the expression of labeling criteria produces a criteria document.