Stemmatology, the study of the relations between texts, is one of the two sciences basic to the study of older languages. The other is the study of the linguistic variation found within and between texts, concerning not only phonology and syntax, but also genre and the location in time and space of the language of these texts. Together the two are fundamental to text history.Since the 1970s, new initiatives have been taken to renew interest in Stemmatology, especially with the use of computers, and this volume can be seen as a working atelier, in which several workers exhibit the state of the art.