Comment by rvz

And people always have a hard time understanding what a certain degree of accuracy actually means. E.g. when you hear that a speech recognition system has 95% accuracy (5% WER), it means that it gets every 19th word wrong. That's abysmally bad by human standards - errors in every other sentence. That does not mean it's useless, but you do need to understand very clearly what you're dealing with, and what those errors might do to the rest of your system.