Even experienced research groups like Nielsen Norman can get testing wrong by adding too many variables. The author argues that too many variables changed in these tests
I reviewed 47 wordpress templates for a competition earlier this year. 98% of them used a "flat" design approach. Of course, we're seeing this style of design pervade websites.
Is this a good thing? Nielsen Norman Group says we can use flat designs if we follow some smart guidelines.
And he's right.