12. A system comprising: a computer including a network adapter configured to receive connections from external computers, the computer being configured to receive streaming text from a conversation and to determine when to classify the streaming text into one of thematic categories and labels from a predefined set, using a measure of certainty, by performing entropy calculations at a plurality of time instances during receipt of the streaming text, and by selecting a decision point in response to the entropy calculations, the decision point being based on text accumulated at the respective time instances, and to perform a classification operation at the decision point, prior to completion of the conversation.
15. The system in accordance with claim 12 , and comprising an output device, wherein the system is configured to output classification information, using the output device, to assist a human at the selected decision point.