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Please predict whether this patent is acceptable.PATENT ABSTRACT: A method, system and computer software product for tuning a classification system. The tuning method receives training data including items, each associated with a training class label, and obtains test data including association of each item with an automatic class label and corresponding values of a first confidence level and a second confidence level. Per automatic class, the method generates two or more performance metrics based on the training data and the test data. The method selects, for each automatic class, a preferred pair of values of the first confidence threshold and the second confidence threshold for which, by rejecting all items bellow the first and second thresholds, with respect to all of the automatic classes, a global optimum condition of the performance metrics is met.