15. A computer-readable storage device having instructions stored which, when executed by a computing device, result in the computing device performing operations comprising: receiving, via a processor and from a user, a plurality of speech samples of a same word, wherein the plurality of speech samples of the same word comprises a current speech sample and a plurality of previously recorded speech samples; generating, via the processor, a sample similarity from the plurality of speech samples; making a decision, via the processor, whether to enroll the user in a speech verification system according to a comparison of the sample similarity with a threshold, wherein the decision is a first decision if the sample similarity is above the threshold and the decision is a second decision different from and mutually exclusive with the first decision if the sample similarity is below the threshold; and enrolling the user in the speech verification system based at least in part on the decision.
15. A computer-readable storage device having instructions stored which, when executed by a computing device, result in the computing device performing operations comprising: receiving, via a processor and from a user, a plurality of speech samples of a same word, wherein the plurality of speech samples of the same word comprises a current speech sample and a plurality of previously recorded speech samples; generating, via the processor, a sample similarity from the plurality of speech samples; making a decision, via the processor, whether to enroll the user in a speech verification system according to a comparison of the sample similarity with a threshold, wherein the decision is a first decision if the sample similarity is above the threshold and the decision is a second decision different from and mutually exclusive with the first decision if the sample similarity is below the threshold; and enrolling the user in the speech verification system based at least in part on the decision. 18. The computer-readable storage device of claim 15 , wherein the comparison results in a variance that identifies how different the first sample is from the second sample.