Depending on how representative designers are of the target audience, a project might need more or less user testing. Still, usability concerns never go away completely.| Nielsen Norman Group
Between the ages of 25 and 60, people's ability to use websites declines by 0.8% per year - mostly because they spend more time per page, but also because of navigation difficulties.| Nielsen Norman Group
Even the tiniest amount of empirical facts (say, observing 2 users) vastly improves the probability of making correct UI design decisions.| Nielsen Norman Group
People scroll vertically more than they used to, but new eyetracking data shows that they will still look more above the page fold than below it.| Nielsen Norman Group
On the average Web page, users have time to read at most 28% of the words during an average visit; 20% is more likely.| Nielsen Norman Group