I'm with Jared,
Eye tracking tells you about common user bahaviour, how people read pages and what they are likely to look at. If you're farily clued up on that already and know your theory it is unlikely you'll learn anything new. Eye tracking tells you what people are looking at but not what they are seeing or what they comprehend. Contextual studies and talking aloud during traditional testing will tell you far more than eye tracking can and are still needed to make sense of any eye tracking work you do. The biggest problem with eye tracking is that the data it's self can be used to reach bad conclusions. The example I have used before is Jakob Neilsen's article on eye tracking and talking head videos. The tests find, unsuprsingly, that people tend to wonder to the stuff around the talking head video rather than look at the video or the face. He incorrectly states that the video is boring. In reality it's down to the content being delivered how interesting the video is, and even then they may not engage with the image but listen to it whilst doing other things!
In short eye tracking, by it's self, will normally tell you what you should know already and any suprises take a lot of untangling to reach an objective outcome, so you have to do use all the techniques you would use even without eye tracking.
The only valid use of eye tracking I can think of is for radically new types of interfaces in unusual situations, to test large scale hypothesis about user interaction, and then eye trackign may be very difficult. This kind of stuff tends to happen at an academic level, not during the design of online experiences.
Hi all, Recently I got chance to try out eye tracking setup for one project. But I'm little confused about what phase is appropriate for using eye tracking. I mean for performance test, we can take tasks and test with users and get observations, for affordance test, I don’t think there is any need of eye tracking setup (as it can be executed by asking questions). So according to my understanding, eye tracking is purely for re-design so is this understanding correct?