I did not see this in the summary: <a href="https://en.wikipedia.org/wiki/Principle_of_least_astonishment" rel="nofollow">https://en.wikipedia.org/wiki/Principle_of_least_astonishmen...</a><p>In my work, the best interfaces almost disappear from consideration. Things just work and people remember getting their work done rather than wrestling with the GUI. When we have been less- or unsuccessful with this, the bug/req report is full.