1. A method of testing a vocabulary word being enrolled in a speech recognition system for acoustic similarity with previously enrolled words, said method comprising the steps of: receiving a first repetition and a second repetition of a speech utterance to be enrolled during an enrollment procedure; after receiving said first repetition and said second repetition of said speech utterance, training a new model based upon said speech utterance using said first repetition of said speech utterance; and after receiving said first repetition and said second repetition of said speech utterance, analyzing said new model for acoustic similarity with previously enrolled words by analyzing said second repetition of said speech utterance.