Depending on the research purpose, each author designed his or her tasks differently. It might be that some authors did not consider he influence of the chosen design factors. In our opinion, the outcomes of above studies sometimes could not only be the result of the mechanisms under the study but also be biased by the chosen design parameters. Are there any influences of test design on consumer gazing behaviour? If yes, which design factors are influencing the gazing behaviour, and how? Finally, how should tasks in an eye-tracking test be designed?