Medicine, astronomy, dealing with numbers ? even the cultures of the “pre-modern” world offer a rich spectrum of scientific texts. But how are they best translated? Is it sufficient to translate the sources into modern scientific language, and thereby, above all, to identify their deficits? Or would it be better to adopt the perspective of the sources themselves, strange as they are, only for them not to be properly understood by modern readers? Renowned representatives of various disciplines and traditions present a controversial and constructive discussion of these problems.