<h1><span class="d-block text-primary">The Once Only Hub.</span>Collaborate to build the future of the Single Market</h1>
<p>The<p class="lead">The EU is making it easier for citizens to study, move, work, retire or do business.
The Once-Only Technical System will connect EU public authorities, so they can exchange official documents and data at the citizen’s request. It puts into practice the Once-Only Principle (OOP), which states that citizens should not be forced to provide information to authorities if another authority already holds that information in electronic format.</p>
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