5. At least one computer readable medium storing program code that, when executed by at least one processor, performs a method for creating a speech interface, the method comprising: accessing, with a computer, a database that includes speech samples associated with any of a plurality of speech controls to a system; calculating a similarity indication between a first set of speech samples associated with a first attribute and a second set of speech samples associated with a second attribute; displaying the similarity indication between the first set and the second set; receiving analytical results of the displayed similarity indication and generating an electronic report of the analytical results; generating a language model regarding the first set based upon the speech samples included in the first set; and calculating a perplexity regarding the first set using the language model regarding the first set; wherein displaying the similarity indication includes displaying a graph where points corresponding to each of the plurality of speech controls are plotted so as to express the similarity indication and a circle is drawn, wherein the circle has one of the points as a center and indicates the perplexity for the speech control corresponding to the one of the points.
5. At least one computer readable medium storing program code that, when executed by at least one processor, performs a method for creating a speech interface, the method comprising: accessing, with a computer, a database that includes speech samples associated with any of a plurality of speech controls to a system; calculating a similarity indication between a first set of speech samples associated with a first attribute and a second set of speech samples associated with a second attribute; displaying the similarity indication between the first set and the second set; receiving analytical results of the displayed similarity indication and generating an electronic report of the analytical results; generating a language model regarding the first set based upon the speech samples included in the first set; and calculating a perplexity regarding the first set using the language model regarding the first set; wherein displaying the similarity indication includes displaying a graph where points corresponding to each of the plurality of speech controls are plotted so as to express the similarity indication and a circle is drawn, wherein the circle has one of the points as a center and indicates the perplexity for the speech control corresponding to the one of the points. 6. The at least one computer readable medium according to claim 5 , wherein the step of preparing the electronic report includes preparing an image of the graph in the electronic report.