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<h2>Who is the Once-Only Hub for?</h2>
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<p><strong>Implementers from EU Member States</strong>, building and maintaining the Once-Only Technical System. A single environment providing them with information and access to services.</p>
<p><strong>Anyone</strong> can browse the Hub to learn more about the system, program and the benefits for them. </p>
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<h2>Architectural design of the Once-Only Technical System</h2>
<p class="lead">The Once-Only Technical System (OOTS) is a technical framework for data sharing. Citizens and businesses will be able to request official documents (known as “evidence”) to complete administrative procedures allowing people to study, work, live and retire in other EU countries. The decentralised architecture connects public authorities, so they can exchange evidences (official documents) at the citizen's request.</p>
<p class="lead">The citizen or business is identified and, having actively confirmed that they wish to use the Once-Only Technical System, is shown a list of the types of document that are possible to be retrieved directly from data sources abroad. The citizen will then select which documents they wish to retrieve from the data sources.</p>
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<div><p class="text-right"><a class="btn ghost" href="#"><span>Download the OOTS Guidance Report</span><span class="ico-download"></span></a></p></div>
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<p class="lead">The technical and operational specifications of the Once-Only Technical System, laid down in the Commission’s Implementing Regulation ((EU) 2022/1463) setting out the system, are complemented by detailed, non-binding technical design documents jointly prepared by the Commission and Member States.</p>

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<p><small>Chapter 1</small></p>
<h3 class="h5">Introduction - High Level Architecture</h3>
<p>This chapter introduces the high-level architecture of the Once-Only Technical System and the key concepts and themes found in the subsequent chapters.</p>
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<p>Release date: <strong>October 2022</strong></p>
<p><a class="btn primary" target="_blank" href="https://ec.europa.eu/digital-building-blocks/sites/x/WoUvHQ"><span>View chapter</span><span class="ico-cta"></span></a></p>
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<p><small>Chapter 2</small></p>
<h3 class="h5">User Identification, Authentication and Record Matching</h3>
<p>This chapter explains how those submitting or receiving evidences through the Once-Only Technical System are identified and authenticated.</p>
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<p>Release date: <strong>October 2022</strong></p> 
<p><a class="btn primary" target="_blank" href="https://ec.europa.eu/digital-building-blocks/sites/x/mYUvHQ"><span>View chapter</span><span class="ico-cta"></span></a></p>
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<p><small>Chapter 3</small></p>
<h3 class="h5">Common Services</h3>
<p>This chapter looks at the Common Services (provided by the Commission) necessary for the proper execution of the evidence exchange process.</p>
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<p>Release date: <strong>October 2022</strong></p> 
<p><a class="btn primary" target="_blank" href="https://ec.europa.eu/digital-building-blocks/sites/x/vYUvHQ"><span>View chapter</span><span class="ico-cta"></span></a></p>
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<p><small>Chapter 4</small></p>
<h3 class="h5">Evidence Exchange</h3>
<p>This chapter introduces evidence exchange in the Once-Only Technical System, which is based on bilateral data exchange between relevant authorities.</p>
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<p>Release date: <strong>October 2022</strong></p>
<p><a class="btn primary" target="_blank" href="https://ec.europa.eu/digital-building-blocks/sites/x/4IUvHQ"><span>View chapter</span><span class="ico-cta"></span></a></p>
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<p><small>Chapter 5</small></p>
<h3 class="h5">Data Models</h3>
<p>This chapter looks at the data models that streamline the exchange of evidences, together with a methodology for defining new data models and code lists.</p>
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<p>Release date: <strong>October 2022</strong></p> 
<p><a class="btn primary" target="_blank" href="https://ec.europa.eu/digital-building-blocks/sites/x/T4YvHQ"><span>View chapter</span><span class="ico-cta"></span></a></p>
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<p><small>Chapter 6</small></p>
<h3 class="h5">OOTS Guidance & UX Recommendations</h3>
<p>This chapter provides an overview of how the Once-Only Technical System works as part of the wider Single Digital Gateway and looks at the first set of UX recommendations.</p>
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<p>Release date: <strong>October 2022</strong></p> 
<p><a class="btn primary" target="_blank" href="https://ec.europa.eu/digital-building-blocks/sites/x/P4CYI"><span>View chapter</span><span class="ico-cta"></span></a></p>
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<p><a class="btn ghost" target="_blank" href="https://ec.europa.eu/digital-building-blocks/sites/x/PQF1Fg"><span>View all latest chapter releases</span><span class="ico-cta"></span></a></p>

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