The document discusses the Once-Only Principle Project (TOOP), an EU-funded project aimed at establishing a digital single market in Europe. The project seeks to (1) bridge data silos and reduce duplication by enabling information to be accessed once and reused many times across borders and sectors; (2) be user-centric and bring most-used citizen services online with cross-border access; and (3) decrease administrative burdens through increased data sharing between public agencies. The TOOP project has run pilots involving 20 EU member states and over 50 partners from public administrations, universities, and businesses to test the feasibility of the Once-Only Principle across Europe.