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<h2>Introduction to the Once-Only Technical System (OOTS)</h2>
<p>The Once-Only Technical System (OOTS) is a technical framework for data sharing. As of the end of 2023, 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 in 7 simple steps. The decentralised architecture connects public authorities, so they can exchange evidence at the citizen's or business' request.</p>
<p>The Guidance Presentation provides a useful introduction tofor teams across the EU working on the implementation of the Once-Only Technical System.</p>
<p><a class="btn primary" href="https://ec.europa.eu/digital-building-blocks/sites/download/attachments/592642240/OOTS-guidance-Q3-2022.pdf"><span>Download the Guidance Presentation</span><span class="ico-download"></span></a></p> </div>
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<div><h3>Mapping of architecture to the user journey</h3></div>
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<li><div><span>1</span><p><strong>Authenticate: </strong>The user authenticates with an eIDAS notified eID scheme</p></div></li>
<li><div><span>2</span><p><strong>Locate evidence: </strong>The procedure portal identifies what to ask for (Evidence Type), and who to ask it from (Evidence Provider)</p></div></li>
<li><div><span>3</span><p><strong>Evidence request: </strong>The request for evidence is sent to the Evidence Provider</p></div></li>
<li><div><span>4</span><p><strong>Redirect: </strong>The user is redirected to the provider side</p></div></li>
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<li><div><span>5</span><p><strong>Preview: </strong>The user previews their evidence</p></div></li>
<li><div><span>6</span><p><strong>Evidence response: </strong>The Evidence Provider responds to the evidence request</p></div></li>
<li><div><span>7</span><p><strong>Submit: </strong>The user completes and submits his/her procedural form</p></div></li>
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<h4>High-level architecture</h4>
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