"Over the last couple of years, I have been working on making Qubes OS - a secure operating system - more usable for both hackers and the less technically brilliant users. It has been a very interesting journey that has taught me a lot about clever hackers, so-called normal people and the way you can make security and usability work together, not against each other."
https://media.ccc.de/v/38c3-ux-for-hackers-why-it-matters-and-what-can-you-do