5. The method of claim 1 , wherein the non-scorable response filters include an audio-quality filter, an insufficient-speech filter, an off-topic-speech filter, and an incorrect-language filter.
5. The method of claim 1 , wherein the non-scorable response filters include an audio-quality filter, an insufficient-speech filter, an off-topic-speech filter, and an incorrect-language filter. 10. The method of claim 5 , wherein the incorrect-language filter uses a language identification method that is a combination of a fluency metric, a phone recognizer and a plurality of language models, wherein each of the language models is associated with a different language and wherein the language is not known a priori.