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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 overview</span><span class="ico-cta-forward"></span></a></p>
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<p><img aria-hidden="true" alt="" class="architectural-design-illu" src="https://ec.europa.eu/digital-building-blocks/sites/download/attachments/565379323/illu-oots-user-journey.png"></p>
<h3 class="h5">Once-Only Technical System - user journey for cross-border procedures</h3>
<p class="opacity-75">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.</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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<p><img aria-hidden="true" alt="" class="architectural-design-illu" src="https://ec.europa.eu/digital-building-blocks/sites/download/attachments/565379323/illu-oots-architecture.png"></p>
<h3 class="h5">Once-Only Technical System architecture</h3>
<p class="opacity-75">The Once-Only Technical System architecture adopts a decentralised approach, integrating and connecting systems through an interoperability layer using reusable "Building Blocks"."</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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