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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 resulting from the common efforts of 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 OOTS and the key concepts and themes found in the subsequent chapters.</p>
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<p>Release date: <strong>October 2022</strong></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 evidence requesters or evidence provider  are identified and authenticated when performing  a procedure using the OOTS to exchange evidence. This chapter looks at the use and purpose of the eID Building Block and eIDAS attributes in the OOTS to support user identification and authentication.</p>
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<p>Release date: <strong>October 2022</strong></p> 
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<p><small>Chapter 3</small></p>
<h3 class="h5">Common services</h3>
<p>This chapter looks at those Common Services identified by the Member States and European Commission necessary for the proper execution of the evidence exchange process within the OOTS:<br>
- Data Service Directory (DSD)<br>
- Evidence Broker (EB)<br>
- Semantic Repository (SR).</p>
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<p>Release date: <strong>October 2022</strong></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 OOTS, which is based on bilateral exchange between competent authorities.</p>
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<p>Release date: <strong>October 2022</strong></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 to ensure the quality of the evidence exchanged between the Member States.</p>
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<p>Release date: <strong>October 2022</strong></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 (OOTS) of the Single Digital Gateway (SDG) works and looks at the first set of UX recommendations.</p>
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<p>Release date: <strong>October 2022</strong></p> 
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<h2>Common services</h2>
<p class="opacity-75">The common services are developed and maintained by the European Commission and make certain functions available in order to achieve organisational interoperability. These enable the business processes of discovering and getting the required evidence. The Commission provides these common services to allow the proper execution of the evidence exchange process.</p>

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<p><img aria-hidden="true" alt="" src="https://ec.europa.eu/digital-building-blocks/sites/download/attachments/565379323/ico-assured-workload-secondary.svg"></p>
<h3 class="h5">Evidence Broker (EB)</h3>
<p class="opacity-75">The Evidence Broker is an authoritative system that maps specific data sets as evidence types providing specific requirements. An evidence requester consults the Evidence Broker to find which types of evidence can be requested as evidence for a specific evidence subject, considering the subject's location and/or jurisdiction.</p>
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<p><span class="badge sm">In development</span></p>
<p class="opacity-50">Expected release date: <strong>December 2022</strong></p>
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<p><img aria-hidden="true" alt="" src="https://ec.europa.eu/digital-building-blocks/sites/download/attachments/565379323/ico-article-secondary.svg"></p>
<h3 class="h5">Data Service Directory (DSD)</h3>
<p class="opacity-75">The Data Service Directory acts as a catalogue of Evidence types that evidence providers can provide upon request. It is used in the Evidence Exchange process by the Evidence Requesters to discover the Evidence Providers that can provide the evidence they require.</p>
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<p><span class="badge sm">In development</span></p> 
<p class="opacity-50">Expected release date: <strong>December 2022</strong></p>
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<p><img aria-hidden="true" alt="" src="https://ec.europa.eu/digital-building-blocks/sites/download/attachments/565379323/ico-dns-secondary.svg"></p>
<h3 class="h5">Semantic Repository (SR)</h3>
<p class="opacity-75">The Semantic Repository acts as a data portal for the Once-Only Technical System. It stores commonly agreed information models grouped by domain.</p>
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<p><span class="badge sm">In development</span></p> 
<p class="opacity-50">Expected release date: <strong>December 2022</strong></p>
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