# 4.1. Introduction

<span lang="EN-GB">The E2 system is built around the ECCAIRS Taxonomy, constituted by ADREP Taxonomy + ECCAIRS/EU specific Taxonomy. While most of it is centrally maintained, per specific governance through the NA’s established Data and Quality Working Group, there is also the possibility for Authorities to maintain their own Custom Taxonomy, which allows them to adapt their usage of E2 to their own processes. The same applies to the SRIS Taxonomy for safety recommendations.</span>

<span lang="EN-GB">To access the Taxonomies, the National Security Administrator has to access the Taxonomy menu.</span>

[![image.png](https://help.ci-aviationreporting.eu/uploads/images/gallery/2025-11/scaled-1680-/SBMimage.png)](https://help.ci-aviationreporting.eu/uploads/images/gallery/2025-11/SBMimage.png)

<span lang="EN-GB"> </span>The system will display the list of Taxonomies in force for the Authority of the National Security Administrator. It includes the Custom and Central Taxonomies released and ECCAIRS and SRIS Taxonomies depending on the Authority type (NAA, SIA or both).

[![image.png](https://help.ci-aviationreporting.eu/uploads/images/gallery/2025-11/scaled-1680-/7dbimage.png)](https://help.ci-aviationreporting.eu/uploads/images/gallery/2025-11/7dbimage.png)

<span lang="EN-GB" style="mso-fareast-language: EN-GB; mso-no-proof: yes;"> </span>

<span lang="EN-GB">National Security Administrators can filter ‘All’, ECCAIRS and SRIs Taxonomies through the tabs displayed above the table.</span>

<span lang="EN-GB">The table of Taxonomies present the following columns that also work as filters:</span>

<span lang="EN-GB" style="font-family: Symbol; mso-fareast-font-family: Symbol; mso-bidi-font-family: Symbol; color: #1b3891; mso-themecolor: text1;"><span style="mso-list: Ignore;">·<span style="font: 7.0pt 'Times New Roman';"> </span></span></span><span lang="EN-GB">Name: unique for each Taxonomy</span>

<span lang="EN-GB" style="font-family: Symbol; mso-fareast-font-family: Symbol; mso-bidi-font-family: Symbol; color: #1b3891; mso-themecolor: text1;"><span style="mso-list: Ignore;">·<span style="font: 7.0pt 'Times New Roman';"> </span></span></span><span lang="EN-GB">Version: your digits separated by dots</span>

<span lang="EN-GB" style="font-family: Symbol; mso-fareast-font-family: Symbol; mso-bidi-font-family: Symbol; color: #1b3891; mso-themecolor: text1;"><span style="mso-list: Ignore;">·<span style="font: 7.0pt 'Times New Roman';"> </span></span></span><span lang="EN-GB">Status: it can be:</span>

<span lang="EN-GB" style="font-family: Wingdings; mso-fareast-font-family: Wingdings; mso-bidi-font-family: Wingdings; color: #1b3891; mso-themecolor: text1;"><span style="mso-list: Ignore;">ü<span style="font: 7.0pt 'Times New Roman';"> </span></span></span><span lang="EN-GB">Archived</span>

<span lang="EN-GB" style="font-family: Wingdings; mso-fareast-font-family: Wingdings; mso-bidi-font-family: Wingdings; color: #1b3891; mso-themecolor: text1;"><span style="mso-list: Ignore;">ü<span style="font: 7.0pt 'Times New Roman';"> </span></span></span><span lang="EN-GB">Draft</span>

<span lang="EN-GB" style="font-family: Wingdings; mso-fareast-font-family: Wingdings; mso-bidi-font-family: Wingdings; color: #1b3891; mso-themecolor: text1;"><span style="mso-list: Ignore;">ü<span style="font: 7.0pt 'Times New Roman';"> </span></span></span><span lang="EN-GB">Released</span>

<span lang="EN-GB" style="font-family: Symbol; mso-fareast-font-family: Symbol; mso-bidi-font-family: Symbol; color: #1b3891; mso-themecolor: text1;"><span style="mso-list: Ignore;">·<span style="font: 7.0pt 'Times New Roman';"> </span></span></span><span lang="EN-GB">Taxonomy Reference: it can be:</span>

<span lang="EN-GB" style="font-family: Wingdings; mso-fareast-font-family: Wingdings; mso-bidi-font-family: Wingdings; color: #1b3891; mso-themecolor: text1;"><span style="mso-list: Ignore;">ü<span style="font: 7.0pt 'Times New Roman';"> </span></span></span><span lang="EN-GB">ECCAIRS</span>

<span lang="EN-GB" style="font-family: Wingdings; mso-fareast-font-family: Wingdings; mso-bidi-font-family: Wingdings; color: #1b3891; mso-themecolor: text1;"><span style="mso-list: Ignore;">ü<span style="font: 7.0pt 'Times New Roman';"> </span></span></span><span lang="EN-GB">SRIS</span>

<span lang="EN-GB" style="font-family: Symbol; mso-fareast-font-family: Symbol; mso-bidi-font-family: Symbol; color: #1b3891; mso-themecolor: text1;"><span style="mso-list: Ignore;">·<span style="font: 7.0pt 'Times New Roman';"> </span></span></span><span lang="EN-GB">Description</span>

<span lang="EN-GB" style="font-family: Symbol; mso-fareast-font-family: Symbol; mso-bidi-font-family: Symbol; color: #1b3891; mso-themecolor: text1;"><span style="mso-list: Ignore;">·<span style="font: 7.0pt 'Times New Roman';"> </span></span></span><span lang="EN-GB">Release Date</span>

<span lang="EN-GB" style="font-family: Symbol; mso-fareast-font-family: Symbol; mso-bidi-font-family: Symbol; color: #1b3891; mso-themecolor: text1;"><span style="mso-list: Ignore;">·<span style="font: 7.0pt 'Times New Roman';"> </span></span></span><span lang="EN-GB">Languages: for now, there are not translations</span>

<span lang="EN-GB">If the National Security Administrator has the National Taxonomy Administrator role, the list of Taxonomies will also include the Authority's Custom Taxonomies in all the status, if exist. </span>

<span lang="EN-GB">The last section of each row provides a 3-dots menu with the following options for archived Taxonomies:</span>

[![image.png](https://help.ci-aviationreporting.eu/uploads/images/gallery/2025-11/scaled-1680-/hugimage.png)](https://help.ci-aviationreporting.eu/uploads/images/gallery/2025-11/hugimage.png)

<span lang="EN-GB" style="mso-ansi-language: EN-GB; mso-fareast-language: EN-GB;"> </span>

<span lang="EN-GB">The Released Taxonomies provide the following options:</span>

[![image.png](https://help.ci-aviationreporting.eu/uploads/images/gallery/2025-11/scaled-1680-/Utzimage.png)](https://help.ci-aviationreporting.eu/uploads/images/gallery/2025-11/Utzimage.png)

<span lang="EN-GB" style="mso-ansi-language: EN-GB; mso-fareast-language: EN-GB;"> </span>

<span lang="EN-GB">The Custom Project option is shown only if a Draft version of the Taxonomy does not exist. </span>

<span lang="EN-GB">The Draft Taxonomies provide the following options:</span>

[![image.png](https://help.ci-aviationreporting.eu/uploads/images/gallery/2025-11/scaled-1680-/lugimage.png)](https://help.ci-aviationreporting.eu/uploads/images/gallery/2025-11/lugimage.png)