Edward, I guess you missed the typo is a double "is"? This is is a sketch of the directory structure you'll end up with: * * * I do not want to use the list as a "grammar" board, particularly because grammar is more flexible in English than in other languages, and there are, IMO, religious wars in the usage of prepositions at the end of a sentences (top two searches from Google, http://www.getitwriteonline.com/archive/022703.htm and http://www.trinicenter.com/winford/2005/2404.htm). I also agree that Boost documentation should convey what the libraries do and not all of us are professional, technical writers. After all, this is open source ;-) What I can tell you with certainty, is that you'd never see a sentence in Spanish ending with a preposition. It just would not make sense. Regards, Javier