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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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<h3 class="h5">Testing</h3>

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<p>The goal of the OOTS Testing services is to assist Member State teams in implementing the Once-Only Technical System (OOTS) as defined in the Implementing Regulation (IR) and Technical Design Documents (TDDs). Information on the available testing services, including the test platform and tools to facilitate testing can be found on the following protected wiki space.</p> 
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<p>Member State teams that would like to get access are invited to contact their National Coordinator or the EC OOTS Support Desk via mail: <a href="mailto:EC-OOTS-SUPPORT@ec.europa.eu" target="_blank">EC-OOTS-SUPPORT@ec.europa.eu</a></p>
<p><a class="btn ghost" target="_blank" href="#mailto:EC-OOTS-SUPPORT@ec.europa.eu"><span>Contact via email</span><span class="ico-email"></span></a></p>
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<p class="lead">The service desk helps Contributors get access to the Confluence and answers to any technical issues. Contributors are added to specific user groups which allow them to see the dedicated pages of the sub-groups they are working on.</p>
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