Eye tracking by itself is interesting but I don't think it gives you the real story or the entire story. I was recently involved in a project that combined eye tracking, biometric feedback, and usability observation/testing. Based on writing the reports, it was obvious to me that of those 3, usability observation/testing was the only piece that could stand alone. THe eye tracking and biometrics helped support the usability portion and validated a lot of the usability data. For me, during the sessions, I had a screen where I could see the eye tracking as it happened and it really helped me to see when they got bored reading the text on the screen because their eyes were no longer reading line by line and were jumping everywhere. I just wouldn't do eyetracking alone. Doesn't mean much.
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