The GTI often considers documents in different languages as if they were the same entity if the title and the publication year correspond. But in reality a publication and its translation in other languages can have the same title quite easily, one only needs to think of biographies to get good examples (e.g. titles like “Picasso”). It is very complicated to explain to patron users why they get a book in a different language. And it can be frustrating for them, as they need to place a new request and wait much longer than expected before getting what they wanted. It can also mean higher costs for patrons and/or libraries to organize the delivery. We therefore recommend that the language is included as parameter in the GTI index.