This open access State-of-the-Art Survey describes and documents the developments and results
of the Once-Only Principle Project (TOOP). The Once-Only Principle (OOP) is part of the seven
underlying principles of the eGovernment Action Plan 2016-2020. It aims to make the government
more effective and to reduce administrative burdens by asking citizens and companies to provide
certain standard information to the public authorities only once. The project was horizontal
and policy-driven with the aim of showing that the implementation of OOP in a cross-border and
cross-sector setting is feasible. The book summarizes the results of the project from policy
organizational architectural and technical points of view.
