Page History

Once-Only Technical System is a technical framework for data sharing. Citizens and businesses will be able to request “evidence” to complete administrative procedures (allowing people to study, work, live and retire in other EU countries). The decentralised architecture connects public authorities, so they can exchange official documents and data at the citizen's request.

 </p>
<p class="lead">The citizen or business is identified and, having actively confirmed that the Once-Only Technical System should be used, is shown a list of the types of document that are possible to be retrieved directly from data sources abroad. The citizen will then select which documents they wish to retrieve from the data sources.</p>

<p class="text-right"><a class="btn ghost" href="#"><span>Download the OOTS Guidance Report</span><span class="ico-download"></span></a></p>

<div class="card-grid">
<div class="card-grid-body">
<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>
</div>
<div class="card-grid-footer">
<p>Release date: <strong>October 2022</strong></p>
<p><a class="btn primary" href="#"><span>View chapter</span><span class="ico-cta"></span></a></p>
</div>
</div>

<div class="card-grid">
<div class="card-grid-body">
<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>
</div>
<div class="card-grid-footer">
<p>Release date: <strong>October 2022</strong></p> 
<p><a class="btn primary" href="#"><span>View chapter</span><span class="ico-cta"></span></a></p>
</div>
</div>

<div class="card-grid">
<div class="card-grid-body">
<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>
</div>
<div class="card-grid-footer">
<p>Release date: <strong>October 2022</strong></p> 
<p><a class="btn primary" href="#"><span>View chapter</span><span class="ico-cta"></span></a></p>
</div>
</div>

<div class="card-grid">
<div class="card-grid-body">
<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>
</div>
<div class="card-grid-footer">
<p>Release date: <strong>October 2022</strong></p>
<p><a class="btn primary" href="#"><span>View chapter</span><span class="ico-cta"></span></a></p>
</div>
</div>

<div class="card-grid">
<div class="card-grid-body">
<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>
</div>
<div class="card-grid-footer">
<p>Release date: <strong>October 2022</strong></p> 
<p><a class="btn primary" href="#"><span>View chapter</span><span class="ico-cta"></span></a></p>
</div>
</div>

<div class="card-grid">
<div class="card-grid-body">
<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>
</div>
<div class="card-grid-footer">
<p>Release date: <strong>October 2022</strong></p> 
<p><a class="btn primary" href="#"><span>View chapter</span><span class="ico-cta"></span></a></p>
</div>
</div>

<p><a class="btn ghost" href="#"><span>View all latest chapter releases</span><span class="ico-cta"></span></a></p>