The aim of this paper is to analyze the phenomenon of successions, in the field of the «amministrazione di sostegno», an institution introduced by the Law no. 6 of January 9, 2004. In particular, the succession is anlyzed in the perspective of its most important elements, such as the testamenti factio activa, the ability to receive by will and, lastly, the institution of the «sostituzione fedecommissaria». Precisely, the main orientations of the Italian authors are examinated and, also, the position of the case-law. From the latter it is possible to infer, as we will see, the important role that our legal system gives to people with limited capacity in the field of inheritance.