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{_______________________________________}

A few weeks later, the release of Tails 1.0 got press coverage on [The Verge](https://www.theverge.com/2014/4/29/5664884/this-is-the-most-secure-computer-you-ll-ever-own), [CNET](https://www.cnet.com/news/anonymous-os-reportedly-favored-by-nsa-whistle-blower-edward-snowden-reaches-version-1-0/), Boing Boing, and many others. In December, Der Spiegel published internal NSA slides that categorize Tails as "catastrophic impact" and "highest priority":

[[!img nsa.png link="no"
alt="Tor, TrueCrypt, Tails are classified as 'Use Risk: Current Highest
Priority Target Use' and 'Impact: Catastrophic (near-total loss/lack of
insight to target communications, presence)'"]]

Since these first usability tests in 2014, we systematically relied on user-centered design practices to ensure that all the major changes that we do in Tails are making it easier to use. We conducted 10 sessions of usability tests, used [paper prototypes](https://simplysecure.org/blog/formative-testing), conducted [[!tails_blueprint veracrypt desc="quantitative surveys"]], and defined better our audience using [[personas|contribute/personas]].

[[<img src="https://gitlab.tails.boum.org/tails/ux/-/raw/master/personas/personas-small.png" id="picture" class="img-responsive" alt="Our 3 personas: Riou, Cris, and Kim">|contribute/personas]]

This usability work was key in all the work that we did since 2015 to make Tails easier to install:

- The [[installation instructions|install]] (2016) - The [[verification extension|install/download]] (2016) - The new [[Welcome Screen|news/version_3.0#greeter]] (2017) - The shift to [[USB images and Etcher|news/version_3.12#usb-images]] (2019)

Continuous integration

To cope with this rapid development and the many releases, we built a cutting edge *continuous integration* infrastructure:

Images of Tails are [built automatically](https://nightly.tails.boum.org/) every time we develop a change for an upcoming release.

These images are [[tested automatically|contribute/release_process/test/automated_tests]] against a comprehensive list of usability and security scenarios.

All our images are [[reproducible|news/reproducible_Tails]], which allows security researchers to verify that the images distributed on our website have not been modified to introduce undisclosed security vulnerabilities.

The following video shows the test suite in action. On the left, it displays the scenario that is being tested, for example "*symmetrically encrypting a message*". On the right, it displays Tails being manipulated automatically according to the scenario.

<video controls="true" width="880" height="352">
<source src="https://tails.net/news/celebrating_10_years/test-suite.mp4" type="video/mp4" />
</video>

This infrastructure increases the quality and reliability of our releases. It also makes it faster to publish emergency security releases when important vulnerabilities are fixed, for example in Firefox and Tor Browser.

Project sustainability

The combination of these efforts both on visible improvements and behind the scene had to go hand-in-hand with working on the sustainability of the project as an organization.

Since 2014:

The number of Tails users was multiplied by 2.4, increasing by 20% each year on average, reaching 25000 daily users on average in 2019. Our yearly budget was multiplied by a similar amount, to reach 240&#8239;000€ (estimated) in 2019.

We worked on foundational documents and processes to ensure a healthy community and project, such as our Code of Conduct, [[Social Contract|doc/about/social_contract]], and [[Missions and values|contribute/mission]].