The Once - Only Principle Project and Emerging Technologies in the public Sector


The Once-Only Principle Project (TOOP) was launched by the European Commission in January 2017 as an initiative of about 51 organisations from 21 EU Member States and Associated Countries.

The main objective of TOOP is to explore and demonstrate the once-only principle across borders, focusing on data from businesses. Doing this, TOOP wants to enable better exchange of business related data or documents with and between public administrations and reduce administrative burden for both businesses and public administrations.


Businesses will benefit from the solutions developed by TOOP as they will be able to fulfill legal obligations by reduced administrative burden, time- and cost-savings. At the same time, the data that have been provided to public administrations will always remain under full control and consent of the businesses involved, in line with EU data protection legislation.

Date start
Date end
Type of project
CO-CREATION-02-2016: User-driven innovation: value creation through design-enabled innovation (IA)