1. A method of increasing the likelihood that an input string is correctly identified by a system, the method comprising: determining a probability that each word in the input string was correctly identified by the system; determining a probability that input string comprises a recognized command; determining whether the probability that the words were correctly identified by the system is greater than the probability that the input string comprises a recognized command; responsive to a determination that the probability that the words were correctly identified by the system is greater than the probability that the input string comprises a recognized command, providing feedback to the user intended to elicit a different input string; and responsive to a determination that the probability that the words were correctly identified by the system is not greater than the probability that the input string comprises a recognized command, providing feedback to the user intended to elicit the same input string spoken more clearly.