As explained by Chris Forstall in his earlier post, we are currently experimenting with a new cross-language detection feature over on the Tesserae Development server. We are using two different approaches, and the IBM Model 2 alignment approach bears a little explanation. The purpose of this post is to provide a simple introduction to the theory behind the algorithm; a link to my PERL script which aligns two texts in Tesserae format will be provided at the end.