18. The method of claim 1 further including a step: determining a set of sentences for inclusion as challenge text based on an articulation difficulty score for a computer synthesis engine.
18. The method of claim 1 further including a step: determining a set of sentences for inclusion as challenge text based on an articulation difficulty score for a computer synthesis engine. 20. The method of claim 18 wherein said set of sentences are extracted automatically from a corpus that includes web logs, newspapers, books and/or the Internet.