1) Make a A/B test with an annoying pop-up sign-up box and an ordinary unobtrusive one.
2) Data shows that more people sign up using the pop-up.
3) Obviously people want to sign up, but can't find the unobtrusive box.
4) Hence, the pop-up design helps people achieve their goal (of signing up) better and is therefore more user friendly.
1) Make a A/B test with an annoying pop-up sign-up box and an ordinary unobtrusive one.
2) Data shows that more people sign up using the pop-up.
3) Obviously people want to sign up, but can't find the unobtrusive box.
4) Hence, the pop-up design helps people achieve their goal (of signing up) better and is therefore more user friendly.