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Once you have decided that eye tracking can in fact generate useful insight that will address your study objectives, you can move on to the second question in the to-track-or-not-to-track question set shown in Figure 2.1. Now is when you should determine if your research questions can be answered by methods simpler than eye tracking. Follow the principle of parsimony, which states to avoid unnecessary complexity and use the simplest possible solution.

Why is this step necessary? Adding eye tracking to a study means extra cost related to equipment, software, moderator training, additional time in the session, and additional preparation and analysis time. Traditional usability testing methods, including behavior observation and verbal protocol, are still quite effective, and are also less costly and less time-consuming.