6. A method of adapting the user interface in systems that accept speech input and perform automatic speech recognition (ASR), comprising the steps of receiving an utterance; processing said utterance using ASR to generate an interpretation of said utterance and to determine a level of confidence in said interpretation; and selectively adapting the verification of said interpretation requested from the user as a function of said confidence level, storing, for each user of said system, information representing a success measure computed as a function of previous uses of said system, and retrieving information and altering the user interface as a function of the value of said success measure.
9. The method defined in claim 6 wherein said method further includes comparing said success measure to a user dependent threshold.