8. A system comprising: at least one storage medium configured to store a plurality of machine-readable instructions; and at least one processor programmed to execute the plurality of machine-readable instructions to perform a method comprising; processing input speech to determine if clarification of the input speech is desired because the spoken dialog system has returned at least two speech recognition hypotheses having similar confidence values for at least a portion of the input speech; retrieving, if clarification is desired, a first list of items to be played back to the user; identifying acoustically confusable items on the first list of items using at least one measure of confusability; selecting, based, at least in part, on at least one rule in a collection of rules, a disambiguation strategy from a plurality of disambiguation strategies, wherein of the plurality of disambiguation strategies includes a first disambiguation strategy comprising spelling at least a portion of each of at least two of the items in the first list of items and a second disambiguation strategy comprising repeating at least two of the items in the first list of items and identifying a first letter of a word in each of the at least two of the items; generating a disambiguated list of items by modifying at least one of the acoustically confusable items on the first list according to the disambiguation strategy; and playing a prompt comprising the disambiguated list of items back to the user.
8. A system comprising: at least one storage medium configured to store a plurality of machine-readable instructions; and at least one processor programmed to execute the plurality of machine-readable instructions to perform a method comprising; processing input speech to determine if clarification of the input speech is desired because the spoken dialog system has returned at least two speech recognition hypotheses having similar confidence values for at least a portion of the input speech; retrieving, if clarification is desired, a first list of items to be played back to the user; identifying acoustically confusable items on the first list of items using at least one measure of confusability; selecting, based, at least in part, on at least one rule in a collection of rules, a disambiguation strategy from a plurality of disambiguation strategies, wherein of the plurality of disambiguation strategies includes a first disambiguation strategy comprising spelling at least a portion of each of at least two of the items in the first list of items and a second disambiguation strategy comprising repeating at least two of the items in the first list of items and identifying a first letter of a word in each of the at least two of the items; generating a disambiguated list of items by modifying at least one of the acoustically confusable items on the first list according to the disambiguation strategy; and playing a prompt comprising the disambiguated list of items back to the user. 24. The system of claim 8 , wherein the first disambiguation strategy further comprises spelling at least a portion of each of the items in the first list of items and asking the user to select one of the spelled items.