The massive spread of new digital technologies as a social infrastructure has been opening a new era, bringing about disruptive innovation for traditional collective actors (Calise e Musella 2019). Rapid advances in artificial intelligence (AI) and related innovative technologies such as blockchain, machine learning, and Digital Twins have attracted great attention from researchers and practitioners and have opened up a broad range of beneficial opportunities for the public sector. This project aims at producing a comparative analysis with the following objectives: a) Definitions of Digital Twins and the relevance of the concept considering the existing literature b) producing the first systematic review of initiatives and applications of the use of Digital Twin technology in the public domain; c) to investigate different digital policies in several geo political areas; d) to read the digital transformations in the background of the political and constitutional background of each country; e) to understand opportunities and risks of new advancements of the use of automatic processes and Digital Twin in the administrative machinery, so to analyze opportunities, implications, and risks.; f) to investigate future improvement, suggestions and the steps that can be taken to facilitate the development and implementation of Digital Twins in the public administration; g) to elaborate principles and mechanisms to increase the democratic accountability of administrative algorithms, and to improve the institutional design for the legitimacy of algorithmic government.