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<h2>Introduction to the Once-Only Technical System (OOTS)</h2>
<p class="mb-0">The Once-Only Technical System 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>
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<p>Discover the 21 procedures covered by the SDG Regulation in the scope of Once-Only Technical System and how EU citizens and businesses can benefit from Once-Only Technical System.</p>
<p><a class="btn ghost" href="https://ec.europa.eu/digital-building-blocks/sites/display/OOTS/About+OOTS"><span>Discover the Once-Only Technical System</span><span class="ico-cta-forward"></span></a></p>
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<h3>Once-Only Technical System - user journey for cross-border procedures</h3>
<p class="mb-0">The user-journey refers to the steps anyone, a citizen or business, must take when using the Once-Only Technical System with a mind to the overall experience the user has. The Once-Only Technical System aims to make the experience of studying, working and living in other EU Member States as simple as possible.</p>
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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 class="mb-0"><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 class="mb-0"><strong>Submit: </strong>The user completes and submits his/her procedural form</p></div></li>
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<p>Visit the Once-Only Technical System user journey page for a detailed overview of the 7 steps in the Once-Only Technical System (OOTS) journey.</p>
<p><a class="btn ghost" href="https://ec.europa.eu/digital-building-blocks/sites/display/OOTS/User+Journey+-+Step+1+Authentication"><span>Discover the OOTS user journey</span><span class="ico-cta-forward"></span></a></p>
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<h3>Mapping of architecture to the user journey</h3>
<p>"The Once-Only Technical System is a distributed collection of systems. Most of these are independently established and maintained by different EU Member States and, once interacting with one another, form a Once-Only technical "ecosystem."</p>
<p class="mb-0">The Once-Only Technical System architecture adopts a decentralised approach based on integration and interconnection of independent systems by using a loosely coupled ‘interoperability layer’ based on the concept of common, reusable "Building Blocks".</p>
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<p>Understand how the Once-Only Technical System's decentralised high-level architecture connects public authorities so that they can exchange evidence at the request of a citizen or business."</p>
<p><a class="btn ghost" href="https://ec.europa.eu/digital-building-blocks/sites/display/OOTS/Architecture"><span>Learn about the OOTS architecture</span><span class="ico-cta-forward"></span></a></p>
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