In a study by Nalanagula, et al. (2006), different feedforward systems were investigated. Like the Nickles, et al. (2003) study, static and dynamic displays were used to gauge visual inspection performance. Nalanagula, et al. (2006) also utilized a hybrid feedforward display that used elements from both a static and dynamic system. The static display offered a view of the overall search pattern to be used, shown overlaid on the part to be inspected.