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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 resultingjointly from the common efforts ofprepared by 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 OOTSOnce-Only Technical System 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 evidencethose requesterssubmitting or evidencereceiving 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 authenticationevidences through the Once-Only Technical System are identified and authenticated.</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<Services</h3>
<p>This chapter looks at thosethe Common Services identified(provided 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)Commission) necessary for the proper execution of the evidence exchange process.</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 OOTSOnce-Only Technical System, which is based on bilateral data exchange between competentrelevant 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)works as part of the wider 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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