I love the five second test for it’s simplicity: Show somebody your page for five seconds, then ask him/her what the person remembers. There is even a free remote testing platform for it.
The five second test is like a bootstrapped eye tracking experiment for one page. But it does not replace other forms of usability testing, not even in an agile setting.
Why it is helpful, IMHO:
How to conduct a five second test to improve your landing pages weiterlesen