Law no. 328/2000 on the integrated system of interventions and social services has had a fundamental importance in the developing and innovating the system of social services in Italy in the last two decades. Its contents have given the protagonists of local welfare the coordinates and the tools to initiate a profound restructuring of the services network. In the twentieth anniversary of its approval, a work program shared between Anci, Cittalia – Anci Foundation, Ifel Foundation and the Department of Education of Roma Tre University has analyzed the impact that the Law has had on the recent transformations of the social services system. The book proposes a series of papers that sign the steps of a work program (an observatory on social practices in local autonomies, the creation of a cycle of webinars, the activation of study groups on: elderly and non self-sufficient people, disabled people, minors and families, poverty and marginalization and integration policies), whose final moment was the conference titled Twenty years of Law no. 328/2000 in the Penisola: the transformations of local welfare organized November 13, 2020.