Eye tracking makes it easy for observers to follow the events live or in retrospect. Even if the test person does not want to, or cannot, comment on their interaction behavior, eye tracking makes clear not only what they are doing in the moment, but often also why they are doing it.
We use eye tracking as a window to view the thinking of our test persons in the usability test. It is an additional measuring method, which has the advantage that it cannot be deliberately falsified by test persons.
In testing, we generally rely on the so-called view location overlay. Eye and mouse movements are synchronized with the live image from the monitor. The image inserted into picture is a video signal with the facial expression and the voice of the test person.
A standard eye tracker delivers 125 readings per second, 7500 readings per minute. This data flow cannot be interpreted meaningfully without precise questioning. The preparation, execution and evaluation of a usability test with eye tracking requires a high level of knowledge and conscientious work.
In co-operation with the Hochschule für Technik und Wirtschaft, we are running an eye-movement laboratory at the Oberschöneweide site.