1. A method of determining the consistency of training data for a machine translation system, comprising: receiving a signal indicative of a source language corpus and a target language corpus; extracting a textual string from the source language corpus; aligning the source language corpus with the target language corpus to identify a translation for the textual string from the target language corpus; calculating a consistency index based on a relationship between the textual string from the source language corpus and the translation; and storing an indication of the consistency index onto a tangible medium.