Word Sense Disambiguation vs. Statistical Machine Translation 
 We directly investigate a subject of much recent debate: do word sense disambigation models help statistical machine translation quality ? We present empirical results casting doubt on this common, but unproved, assumption. Using a state-of-the-art Chinese word sense disambiguation model to choose translation candidates for a typical IBM statistical MT system , we find that word sense disambiguation does not yield significantly better translation quality than the statistical machine translation system alone. Error analysis suggests several key factors behind this surprising finding, including inherent limitations of current statistical MT architectures . 